Fitness system and method for marking weight values

Abstract

The present invention provides a fitness system and a method for marking weight values. The fitness system includes a counterweight device and an electronic device. The counterweight device includes a plurality of bar plates, a grip shaft, a magnetic field disc, and a magnetic field sensor. The grip shaft rotates in a first direction to increase the number of bar plates engaged by the grip shaft, and rotates in a second direction to decrease the number of bar plates engaged by the grip shaft. The magnetic field disc provides a plurality of first-polarity magnetic fields and a plurality of second-polarity magnetic fields. A plurality of first positions of the plurality of first-polarity magnetic fields and a plurality of second positions of the plurality of second-polarity magnetic fields are alternately arranged in the first direction. When the grip shaft rotates, the magnetic field sensor increments or decrements the weight value of the counterweight device based on the magnetic field polarity changes experienced. The electronic device displays the weight value. The fitness system and the method for marking weight values of the present invention can instantaneously provide the weight value of the counterweight device when the number of installed bar plates is changed.

Description

Technical Field

[0001] The present invention relates to a fitness system, and more particularly to a fitness system with a weight value marking function and a method for marking weight values for a fitness system. Background Art

[0002] For current fitness equipment, such as assembled dumbbells or barbells, when the number of weight plates installed is changed, the changed weight value cannot be provided immediately. Users often need to calculate by themselves to obtain the weight value of the fitness equipment. Such an operation is very inconvenient. Therefore, how to make fitness equipment provide the weight value immediately when the number of weight plates installed is changed is one of the research focuses of those skilled in the art.

[0003] The "Background Art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "Background Art" paragraph may include some conventional technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not represent that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those skilled in the art before the filing of the present invention application. Summary of the Invention

[0004] The present invention provides a fitness system and a method for marking weight values, which can immediately provide the weight value of the counterweight device when the number of weight plates installed is changed.

[0005] Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0006] To achieve one or part or all of the above objects or other objects, an embodiment of the present invention provides a fitness system. The fitness system includes a counterweight device and an electronic device. The counterweight device includes a plurality of weight plates, a grip shaft, a magnetic field disk, and a magnetic field sensor. The grip shaft rotates along a first direction to increase the number of the plurality of weight plates engaged by the grip shaft. The grip shaft rotates along a second direction to decrease the number of the plurality of weight plates engaged by the grip shaft. The weight value of the counterweight device is equal to the sum of the first weight value of the grip shaft and the second weight value of the weight plates engaged among the plurality of weight plates. The second direction is opposite to the first direction. The magnetic field disk is disposed on the grip shaft. The magnetic field disk provides a plurality of first-polarity magnetic fields and a plurality of second-polarity magnetic fields. The plurality of first positions of the plurality of first-polarity magnetic fields and the plurality of second positions of the plurality of second-polarity magnetic fields are alternately arranged in the first direction. The polarity of the plurality of first-polarity magnetic fields is different from the polarity of the plurality of second-polarity magnetic fields. The magnetic field sensor senses the magnetic field on the magnetic field disk. When the grip shaft rotates, the magnetic field sensor increases or decreases the weight value according to the magnetic field polarity change experienced. The electronic device communicates with the counterweight device to receive the weight value and display the weight value.

[0007] To achieve one or some or all of the above purposes or other purposes, an embodiment of the present invention provides a method for marking weight values. The method for marking weight values is used for a fitness system having a counterweight device and an electronic device. The counterweight device includes a plurality of bar plates, a grip shaft, a magnetic field disk, and a magnetic field sensor. The magnetic field disk is disposed on the grip shaft. The method for marking weight values includes: providing, by the magnetic field disk, a plurality of first-polarity magnetic fields and a plurality of second-polarity magnetic fields, wherein a plurality of first positions of the plurality of first-polarity magnetic fields and a plurality of second positions of the plurality of second-polarity magnetic fields are alternately arranged in a first direction, and wherein polarities of the plurality of first-polarity magnetic fields are different from polarities of the plurality of second-polarity magnetic fields; rotating the grip shaft along one of the first direction and a second direction to adjust the number of the plurality of bar plates engaged by the grip shaft, wherein a weight value of the counterweight device is equal to a sum of a first weight value of the grip shaft and a second weight value of the engaged bar plates among the plurality of bar plates, and wherein the second direction is opposite to the first direction; sensing, by the magnetic field sensor, a magnetic field on the magnetic field disk, and incrementing or decrementing the weight value of the counterweight device according to a change in the magnetic field polarity experienced by the magnetic field sensor when the grip shaft rotates; and displaying, by the electronic device, the weight value.

[0008] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. When the grip shaft is rotated to adjust the number of bar plates engaged, the magnetic field sensor instantaneously increments or decrements the weight value according to the change in the magnetic field polarity experienced, and the electronic device displays the weight value. In this way, the present invention can improve the convenience of using the counterweight device.

[0009] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are given below and are described in detail in conjunction with the accompanying drawings as follows. Description of the Drawings

[0010] Figure 1 is a schematic diagram of a fitness system according to an embodiment of the present invention.

[0011] Figure 2 is a schematic diagram of a magnetic field disk according to an embodiment of the present invention.

[0012] Figure 3 is a flowchart of a method for marking weight values according to an embodiment of the present invention.

[0013] Figure 4 is according to Figure 3 a flowchart of the step of rotating the grip shaft to adjust the number of bar plates engaged by the grip shaft in

[0014] Figure 5 is a circuit block diagram of a counterweight device according to an embodiment of the present invention. Detailed Description of the Embodiments

[0015] Some embodiments of the present invention will be described in detail with reference to the accompanying drawings. For the component symbols cited in the following description, when the same component symbols appear in different drawings, they will be regarded as the same or similar components. These embodiments are only a part of the present invention and do not disclose all the implementable ways of the present invention. More precisely, these embodiments are only examples in the claims of the present invention. The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings.

[0016] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic diagram of a fitness system according to an embodiment of the present invention. Figure 2 which is a schematic diagram of a magnetic field disk according to an embodiment of the present invention. The fitness system 10 includes a weight device 100 and an electronic device 200. The weight device 100 can be a fitness equipment such as an assembled dumbbell or barbell. The electronic device 200 can be other portable electronic devices or wearable electronic devices such as a desktop computer, a laptop computer, a tablet computer, a smart phone, etc.

[0017] In this embodiment, the weight device 100 includes bar plates L1 to L6, a grip shaft 110, a magnetic field disk 120, and a magnetic field sensor 130. The grip shaft 110 is operated to be rotated along the central axis of the grip shaft 110, so as to adjust the number of bar plates L1 to L6 engaged. For example, the grip shaft 110 includes an engaging portion 111. The engaging portion 111 has a plurality of engaging mechanisms (not shown) corresponding to the bar plates L1 to L6. The engaging portion 111 increases or decreases the number of bar plates L1 to L6 engaged based on the angle by which the grip shaft 110 is rotated. In this embodiment, the grip shaft 110 is rotated in the first direction D1 to increase the number of bar plates L1 to L6 engaged by the grip shaft 110. The grip shaft 110 is rotated in the second direction D2 to decrease the number of bar plates L1 to L6 engaged by the grip shaft 110. The second direction D2 is opposite to the first direction D1.

[0018] The weight value of the weight device 100 is equal to the sum of the first weight value of the grip shaft 110 and the second weight value of the bar plates L1 to L6 engaged.

[0019] In this embodiment, the magnetic field disk 120 is disposed on the holding shaft 110. For example, the magnetic field disk 120 is sleeved and fixed on the holding shaft 110. When the holding shaft 110 is rotated, the magnetic field disk 120 will also be rotated. The magnetic field disk 120 provides the first-polarity magnetic fields M1_1 to M1_3 and the second-polarity magnetic fields M2_1 to M2_3. The polarities of the first-polarity magnetic fields M1_1 to M1_3 are different from the polarities of the second-polarity magnetic fields M2_1 to M2_3. In other words, the polarities of the first-polarity magnetic fields M1_1 to M1_3 are opposite to the polarities of the second-polarity magnetic fields M2_1 to M2_3. In this embodiment, the polarities of the first-polarity magnetic fields M1_1 to M1_3 are south poles. The polarities of the second-polarity magnetic fields M2_1 to M2_3 are north poles. The positions of the first-polarity magnetic fields M1_1 to M1_3 and the positions of the second-polarity magnetic fields M2_1 to M2_3 are alternately arranged in the first direction D1. For example, the first-polarity magnetic fields M1_1 to M1_3 and the second-polarity magnetic fields M2_1 to M2_3 are established on the disk surface of the magnetic field disk 120. In the first direction D1, the first-polarity magnetic field M1_1, the second-polarity magnetic field M2_1, the first-polarity magnetic field M1_2, the second-polarity magnetic field M2_2, the first-polarity magnetic field M1_3, and the second-polarity magnetic field M2_3 are established in sequence. The positions of the first-polarity magnetic fields M1_1 to M1_3 and the positions of the second-polarity magnetic fields M2_1 to M2_3 are related to the multiple positions where the holding shaft 110 engages with the lever pieces L1 to L6. The first-polarity magnetic fields M1_1 to M1_3 and the second-polarity magnetic fields M2_1 to M2_3 can be implemented by magnets respectively.

[0020] In this embodiment, the magnetic field sensor 130 senses the magnetic field on the magnetic field disk 120. The position of the magnetic field sensor 130 is fixed at a position and senses the magnetic field located on the disk surface of the magnetic field disk 120. When the holding shaft 110 is rotated, the magnetic field sensor 130 increases or decreases the weight value of the weight device 100 according to the magnetic field polarity change experienced. That is, when the holding shaft 110 is rotated, the number of lever pieces L1 to L6 engaged by the holding shaft 110 will be adjusted. In addition, the magnetic field sensor 130 provides a weight value according to the magnetic field polarity change experienced by the magnetic field sensor 130 itself. In this way, when the holding shaft 110 is rotated, the weight device 100 can provide a weight value immediately. In addition, the electronic device 200 communicates with the weight device 100 to receive the weight value and displays the weight value. Therefore, the user can immediately view the weight value of the weight device 100 by using the electronic device 200. In this way, the present invention can improve the convenience of use of the weight device 100. In this embodiment, the magnetic field sensor 130 can be implemented by a Hall sensor.

[0021] It should be noted that in this embodiment, only the magnetic field sensor 130 is used to sense the change in magnetic field polarity to increment or decrement the weight value. This embodiment does not require encoding multiple positions or rotation angles on the magnetic field disk 120, nor does it require installing sensing elements on the lever pieces L1 to L6. In this way, this embodiment provides a weight value marking mechanism with extremely low cost.

[0022] For ease of explanation, the number of magnetic fields and the number of lever pieces in this embodiment are taken as six respectively. The number of magnetic fields and the number of lever pieces of the present invention can be multiple respectively, and are not limited to this embodiment. The present invention is not limited to the shape of the lever pieces and the meshing / disengaging mechanism.

[0023] In this embodiment, when the holding shaft 110 is rotated to the initial position, the weight value is initialized. For example, when the holding shaft 110 is rotated along the second direction D2, the weight value will be decremented. When the holding shaft 110 is rotated to the initial position, the weight value will be initialized to be equal to the first weight value (i.e., the weight of the holding shaft 110 itself).

[0024] Please also refer to Figure 1 、 Figure 2 and Figure 3 , Figure 3 is a method flowchart of a weight value marking method according to an embodiment of the present invention. In this embodiment, the weight value marking method is applicable to the fitness system 10. In step S110, the magnetic field disk 120 provides a plurality of first polarity magnetic fields M1_1 to M1_3 and a plurality of second polarity magnetic fields M2_1 to M2_3. The positions of the first polarity magnetic fields M1_1 to M1_3 and the positions of the second polarity magnetic fields M2_1 to M2_3 are alternately arranged in the first direction D1. In step S120, the holding shaft 110 is rotated to adjust the number of lever pieces L1 to L6 engaged by the holding shaft 110. In step S130, the magnetic field sensor 130 increments or decrements the weight value according to the change in magnetic field polarity experienced by the magnetic field sensor 130 itself. In step S140, the weight value is received by the electronic device 200 and the weight value is displayed. The implementation details of steps S110 to S140 can be sufficiently taught by the embodiments of Figure 1 and Figure 2 and will not be repeated here.

[0025] The implementation details of step S130 will be further described below.

[0026] Please also refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 。 Figure 4 is Figure 3Method flowchart of the step of rotating the holding shaft to adjust the number of bar pieces engaged by the holding shaft. In this embodiment, step S130 includes steps S131 to S135. In step S131, when the holding shaft 110 rotates from the initial position in the first direction D1, and the magnetic field sensor 130 senses the first magnetic field among the first-polarity magnetic fields M1_1 to M1_3 and the second-polarity magnetic fields M2_1 to M2_3, that is, the first-polarity magnetic field M1_1. Next, the magnetic field sensor 130 will enter the increasing mode in step S132 to increase the weight value. Therefore, after completing step S131, the magnetic field sensor 130 will first enter the increasing mode.

[0027] For example, the weight value of the holding shaft 110 and the weight values of the bar pieces L1 to L6 are each 2 kg. When the holding shaft 110 is in the initial position, the weight value is the weight value of the holding shaft 110, that is, 2 kg. In step S131, when the holding shaft 110 rotates from the initial position in the first direction D1, the holding shaft 110 engages with the bar piece L1. The magnetic field disk 120 is rotated by the holding shaft 110, so that the magnetic field sensor 130 senses the first-polarity magnetic field M1_1. Therefore, in step S132, the magnetic field sensor 130 will enter the increasing mode to increase the weight value by 2 kg for the first time. Thus, the weight value becomes 4 kg.

[0028] In step S133, when the holding shaft 110 is rotated, the magnetic field sensor 130 in the increasing mode will determine whether different-polarity magnetic fields are continuously sensed. When the magnetic field sensor 130 continuously senses different-polarity magnetic fields, the currently increasing-mode magnetic field sensor 130 will increase the weight value again in step S132. For example, the magnetic field sensor 130 senses the first-polarity magnetic field M1_1 in step S131 and the second-polarity magnetic field M2_3 in step S133. This means that the holding shaft 110 rotates in the first direction D1 and engages with the bar pieces L1 and L2. Therefore, the currently increasing-mode magnetic field sensor 130 will increase the weight value to 6 kg.

[0029] On the other hand, when the holding shaft 110 is rotated, if the magnetic field sensor 130 in the increasing mode continuously senses a magnetic field of the same polarity (i.e., "no"), the magnetic field sensor 130 will enter the decreasing mode in step S134 to decrease the weight value. For example, the magnetic field sensor 130 senses a magnetic field M1_1 of the first polarity in step S131 and a magnetic field of the same polarity as the magnetic field M1_1 of the first polarity in step S133. Based on the positional relationship between the magnetic fields M1_1 to M1_3 of the first polarity and the magnetic fields M2_1 to M2_3 of the second polarity, this indicates that the magnetic field sensor 130 continuously senses the magnetic field M1_1 of the first polarity. That is, the holding shaft 110 rotates in the second direction D2 and disengages from the disengaging lever piece L1. Therefore, the magnetic field sensor 130 currently in the increasing mode will enter the decreasing mode to reduce the weight value from 4 kg to 2 kg.

[0030] In step S135, when the holding shaft 110 is rotated, the magnetic field sensor 130 in the decreasing mode will determine whether it continuously senses magnetic fields of different polarities. When the magnetic field sensor 130 continuously senses magnetic fields of different polarities, the magnetic field sensor 130 currently in the decreasing mode will decrease the weight value again in step S134. For example, the magnetic field sensor 130 in the decreasing mode first senses the magnetic field M1_3 of the first polarity and then senses the magnetic field M2_3 of the second polarity. Therefore, the magnetic field sensor 130 currently in the decreasing mode will decrease the weight value again.

[0031] It should be noted here that the magnetic field sensor 130 senses the earlier magnetic field among two consecutive magnetic fields in the first mode and senses the later magnetic field among two consecutive magnetic fields in the second mode. The first mode may be different from the second mode. Therefore, in some cases, the magnetic field sensor 130 may continuously sense two magnetic fields of the same polarity or different polarities in different modes. In this embodiment, only the current mode when the later magnetic field among two consecutive magnetic fields is sensed is judged, without considering the previous mode when the earlier magnetic field among two consecutive magnetic fields is sensed.

[0032] On the other hand, when the holding shaft 110 is rotated, if the magnetic field sensor 130 continuously senses a magnetic field of the same polarity (i.e., "no"), the magnetic field sensor 130 currently in the decreasing mode will enter the increasing mode in step S132 to increase the weight value.

[0033] Please refer to Figure 1 and Figure 5 , Figure 5It is a circuit block diagram of a counterweight device shown according to an embodiment of the present invention. In this embodiment, the circuit architecture of the counterweight device 100 includes a magnetic field sensor 130 and a motion sensor 140. The motion sensor 140 senses the displacement operation and the rotation operation of the grip shaft 110 to provide operation data associated with the displacement operation and the rotation operation. The electronic device 200 communicates with the counterweight device 100 to receive the operation data. In this embodiment, the motion sensor 140 can be an inertial measurement unit (IMU) with multi-axis (such as 6-axis or 9-axis) dynamic sensing function.

[0034] In this embodiment, the counterweight device 100 further includes a battery 150, a processor 160, and a communication unit 170. The battery 150 can supply power to the magnetic field sensor 130, the motion sensor 140, the processor 160, and the communication unit 170. The communication unit 170 of this embodiment is disposed inside the processor 160. The processor 160 receives the weight value, the operation data, and the battery power information of the battery 150, and controls the communication unit 170 to provide the weight value, the operation data, and the power information to the electronic device 200. Therefore, the electronic device 200 can obtain the weight value, the operation data, and the power information. In addition, the processor 160 can also perform pairing settings with the electronic device 200 through the communication unit 170.

[0035] In some embodiments, the communication unit 170 can be disposed outside the processor 160.

[0036] In this embodiment, the electronic device 200 will carry an application program. The application program will provide a fitness course suitable for the counterweight device 100. The fitness course will specify the operating weight, the operating actions, and the number of operations of the counterweight device 100. For example, the user learns the operating weight, the operating actions, and the number of operations specified by the fitness course through the application program. Therefore, the user can operate the counterweight device 100 according to the operating weight, the operating actions, and the number of operations.

[0037] During the user's operation of the counterweight device 100, the magnetic field sensor 130 senses the polarity change of the magnetic field M to provide the weight value of the counterweight device 100. The motion sensor 140 senses operation data such as the displacement operation and rotation operation of the grip shaft 110. The processor 160 controls the communication unit 170 to provide the weight value and operation data to the electronic device 200. Therefore, the application program of the electronic device 200 can obtain the weight value and operation data. The application program determines whether the weight value conforms to the operation weight specified in the fitness course and whether the operation data conforms to the operation actions specified in the fitness course. When the weight value conforms to the operation weight specified in the fitness course and the operation data conforms to the operation actions specified in the fitness course, it indicates that the user does indeed operate the counterweight device 100 in accordance with the fitness course and completes a single operation action. Therefore, the application program counts the completed operation actions. Once the count of the operation actions reaches the number of operations, the fitness course ends.

[0038] On the other hand, when the weight value does not conform to the operation weight specified in the fitness course and / or the operation data does not conform to the operation actions specified in the fitness course, the application program does not count the completed operation actions and issues a corresponding warning.

[0039] In addition, the application program also records the fitness history associated with the user's operation of the counterweight device 100.

[0040] It is worth mentioning here that during the operation of the counterweight device 100, the user can use the application program of the electronic device 200 to know whether the weight value and the operation method conform to the specifications of the fitness course. In addition, the user does not need to calculate the weight value and the number of operations by themselves. In this way, the fitness system 10 can improve the user's experience of using the counterweight device 100.

[0041] In this embodiment, the application program can also display the current battery level of the battery 150. When the current battery level of the battery 150 is lower than a threshold, the application program provides a corresponding warning to remind the user.

[0042] In addition, when the application program is enabled, the application program prompts the user to rotate the grip shaft 110 back to the initial position to initialize the weight value.

[0043] In summary, the embodiments of the present invention have at least one of the following advantages or effects. The present invention only uses a magnetic field sensor to sense the change in the magnetic field polarity to increase or decrease the weight value. In this embodiment, it is not necessary to encode multiple positions or rotation angles on the magnetic field disk, nor is it necessary to install sensing elements on the bar piece. In this way, the present invention provides a weight value marking mechanism with extremely low cost. The user can view the weight value of the counterweight device using an electronic device. In this way, the present invention can improve the convenience of using the counterweight device. In addition, the application program of the electronic device will provide fitness courses. During the operation of the counterweight device, the user can use the application program of the electronic device to know whether the weight value and the operation method conform to the specifications of the fitness course. The user also does not need to calculate the number of operations by himself. In this way, the fitness system can improve the user's feeling of using the counterweight device.

[0044] The above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the claims and the content of the specification of the present invention still fall within the scope covered by the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and the invention name are only used to assist in the retrieval of patent documents and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limits of the number of elements.

[0045] Description of Reference Numerals

[0046] 10: Fitness system

[0047] 100: Counterweight device

[0048] 110: Holding shaft

[0049] 111: Engaging portion

[0050] 120: Magnetic field disk

[0051] 130: Magnetic field sensor

[0052] 140: Motion sensor

[0053] 150: Battery

[0054] 160: Processor

[0055] 170: Communication unit

[0056] 200: Electronic device

[0057] D1: First direction

[0058] D2: Second direction

[0059] L1 to L6: Bar pieces

[0060] M: Magnetic field

[0061] M1_1 to M1_3: First-polarity magnetic fields

[0062] M2_1 to M2_3: Second-polarity magnetic fields

[0063] S110 to S140: Steps

[0064] S131 to S135: Steps.

Claims

1. A fitness system, characterized in that, Comprising a counterweight device and an electronic device, The counterweight device includes: A plurality of bar pieces; A grip shaft that rotates in a first direction to increase the number of the plurality of bar pieces engaged by the grip shaft and rotates in a second direction to decrease the number of the plurality of bar pieces engaged by the grip shaft, wherein the weight value of the counterweight device is equal to the sum of the first weight value of the grip shaft and the second weight value of the engaged bar pieces among the plurality of bar pieces, and wherein the second direction is opposite to the first direction; A magnetic field disk disposed on the grip shaft and configured to provide a plurality of first-polarity magnetic fields and a plurality of second-polarity magnetic fields, wherein a plurality of first positions of the plurality of first-polarity magnetic fields and a plurality of second positions of the plurality of second-polarity magnetic fields are alternately arranged in the first direction, and wherein the polarities of the plurality of first-polarity magnetic fields are different from the polarities of the plurality of second-polarity magnetic fields; and A magnetic field sensor configured to sense the magnetic field on the magnetic field disk and, when the grip shaft rotates, increment or decrement the weight value according to the change in the magnetic field polarity experienced; The electronic device communicates with the counterweight device to receive the weight value and display the weight value.

2. The fitness system according to claim 1, wherein When the grip shaft is rotated to an initial position, the weight value is initialized.

3. The fitness system according to claim 1, wherein When the grip shaft rotates from an initial position in the first direction and senses the first magnetic field of the plurality of first-polarity magnetic fields and the plurality of second-polarity magnetic fields, the magnetic field sensor enters an increment mode to start incrementing the weight value.

4. The fitness system according to claim 3, wherein: When different-polarity magnetic fields are continuously sensed, the magnetic field sensor currently in the increment mode increments the weight value, and When the same-polarity magnetic fields are continuously sensed, the magnetic field sensor currently in the increment mode enters a decrement mode to decrement the weight value.

5. The fitness system according to claim 4, wherein: When different-polarity magnetic fields are continuously sensed, the magnetic field sensor currently in the decrement mode decrements the weight value, and When the same-polarity magnetic fields are continuously sensed, the magnetic field sensor currently in the decrement mode enters the increment mode to increment the weight value.

6. The fitness system according to claim 1, wherein, The counterweight device further includes: An action sensor configured to sense the displacement operation and the rotation operation of the grip shaft to provide operation data associated with the displacement operation and the rotation operation, and wherein the electronic device communicates with the counterweight device to receive the operation data.

7. A method for marking weight values, characterized in that, For a fitness system having a counterweight device and an electronic device, wherein the counterweight device includes a plurality of bar pieces, a grip shaft, a magnetic field disk, and a magnetic field sensor, wherein the magnetic field disk is disposed on the grip shaft, and wherein the weight value marking method includes: A plurality of first-polarity magnetic fields and a plurality of second-polarity magnetic fields are provided by the magnetic field disk, wherein a plurality of first positions of the plurality of first-polarity magnetic fields and a plurality of second positions of the plurality of second-polarity magnetic fields are alternately arranged in a first direction, and wherein the polarities of the plurality of first-polarity magnetic fields are different from the polarities of the plurality of second-polarity magnetic fields; Rotate the holding shaft along one of the first direction and the second direction to adjust the number of the plurality of lever pieces engaged by the holding shaft, wherein the weight value of the counterweight device is equal to the sum of the first weight value of the holding shaft and the second weight value of the lever pieces engaged by the holding shaft, and wherein the second direction is opposite to the first direction; Sense the magnetic field on the magnetic field disk through the magnetic field sensor, and when the holding shaft rotates, increase or decrease the weight value of the counterweight device according to the change in the magnetic field polarity experienced by the magnetic field sensor; and Display the weight value through the electronic device.

8. The weight value marking method according to claim 7, characterized in that, Further comprising: Rotate the holding shaft to an initial position to initialize the weight value.

9. The weight value marking method according to claim 7, characterized in that, When the holding shaft rotates, increasing or decreasing the weight value of the counterweight device according to the change in the magnetic field polarity experienced by the magnetic field sensor includes: When the holding shaft rotates along the first direction from an initial position and senses the first magnetic field among the plurality of first-polarity magnetic fields and the plurality of second-polarity magnetic fields, the magnetic field sensor enters an increasing mode to start increasing the weight value.

10. The weight value marking method according to claim 9, characterized in that, When the holding shaft rotates, increasing or decreasing the weight value of the counterweight device according to the change in the magnetic field polarity experienced by the magnetic field sensor further includes: When continuously sensing magnetic fields of different polarities, the magnetic field sensor currently in the increasing mode increases the weight value; and When continuously sensing magnetic fields of the same polarity, the magnetic field sensor currently in the increasing mode enters a decreasing mode to decrease the weight value.

11. The weight value marking method according to claim 10, characterized in that, When the holding shaft rotates, increasing or decreasing the weight value of the counterweight device according to the change in the magnetic field polarity experienced by the magnetic field sensor further includes: When continuously sensing magnetic fields of different polarities, the magnetic field sensor currently in the decreasing mode decreases the weight value; and When continuously sensing magnetic fields of the same polarity, the magnetic field sensor currently in the decreasing mode enters the increasing mode to increase the weight value.

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