Magnetically controlled exercise bike refers to the metal flywheel that produces resistance, and the magnet is close to it. By adjusting the distance between the magnet and the metal flywheel, the resistance can be adjusted to meet the requirements of different exercise intensities. Magnetically controlled exercise bike can effectively prevent hypertension, obesity and arteriosclerosis, and make bones strong. When practicing the magnetic control exercise bike, adjust the distance between two magnets to avoid the loss caused by the adjustment of friction resistance, improve the service life of the exercise bike and make the resistance more uniform.