Fitness device

The embodiment of the invention provides a fitness device which comprises a frame, a flywheel assembly and pedals, and the pedals are in transmission connection with the flywheel assembly. The flywheel assembly comprises a main shaft, a driven wheel, a flywheel body, a one-way bearing and a mode switching assembly. The driven wheel is fixedly arranged on the main shaft and rotates to drive the main shaft to rotate; the mode switching assembly comprises a locking piece and a flywheel gear, the flywheel gear is rotationally connected with the main shaft, and the end, close to the flywheel body, of the flywheel gear is fixedly connected with the flywheel body; the locking piece is arranged on the outer side of the main shaft and the outer side of the flywheel gear, the locking piece can reciprocate along the central axis of the main shaft, the fitness device is in a dead flight mode when the locking piece is located at the first position, and the fitness device is in a movable flight mode when the locking piece