Chest expanding instrument

Abstract

The invention discloses a chest expanding instrument and belongs to the field of exercising instruments. The chest expanding instrument comprises a support, a back support part, arm stretching load-bearing parts and holding devices, wherein the back support part is mounted on the support; the two arm stretching load-bearing parts are mounted on two sides of the back support part, and the arm stretching load-bearing parts can perform resistance-resisting clamping under a horizontal state; the two holding devices are respectively fixedly arranged at the tail ends of the two arm stretching load-bearing parts; each arm stretching load-bearing part comprises an upper arm support part and a lower arm support part, the upper arm support part and the lower arm support part can perform resistance-resisting clamping, and each holding device is fixedly arranged at the tail end of the corresponding lower arm support part. The chest expanding instrument has the advantages that the chest expanding instrument is balanced in shaping effect, movement deformation cannot occur easily, joint damage can be prevented, and the like.

Description

Technical field [0001] The invention relates to a fitness apparatus, in particular to a chest expansion apparatus. Background technique [0002] In the prior art, the fitness equipment used for chest expansion exercises has multiple forms. The more common one is the butterfly arm type fitness equipment. This type of equipment generally has a pair of butterfly arms, and the butterfly arms are connected by a structure such as a wire rope, a pulley, and a counterweight. Form the resistance of the butterfly arm to rotate forward. When in use, the user's lower arm is bent upward to resist the force-bearing part of the butterfly arm, the upper arm and the shoulder remain level, and the force of the pectoral muscle drives the butterfly arm to rotate, thereby completing the chest expansion action. [0003] However, in actual use of the above-mentioned butterfly-arm fitness equipment, since the muscle groups that exert force are only the front part of the pectoralis muscle and the deltoid ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the chest expansion apparatus in the prior art that the shaping effect is too single, the action is easy to lose shape, and the joint is easy to be damaged, so as to provide a more coordinated shaping effect, easy to maintain the action, Breast expansion device with better joint protection effect

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