The utility model relates to the technical field of fitness equipment, in particular to a
dumbbell which comprises a
handle,
dumbbell pieces, a base and a sensor. The
handle comprises a spindle telescopic
assembly, a driving
assembly and a
handle shell
assembly, the spindle telescopic assembly is arranged in the handle shell assembly, and the driving assembly is in power connection with the spindle telescopic assembly. The base is provided with a plurality of clamping grooves used for containing
dumbbell pieces and a containing groove used for containing the handle, the center holes are coaxially aligned when the dumbbell pieces are placed in the clamping grooves respectively, and the telescopic part of the main shaft telescopic assembly can sequentially stretch into the center holes of the dumbbell pieces when stretching out of the penetrating hole in the handle shell assembly. The sensor is arranged in the handle shell assembly and is in
signal connection with the control module, the control module is in
signal connection with the driving assembly, the sensor is used for detecting the telescopic distance of the spindle telescopic assembly, and the control module can control starting and stopping of the driving assembly. The weight of the dumbbell can be automatically adjusted only by sending a control instruction to the control module, and operation is more convenient and labor-saving.