At present, astronauts can only tie themselves to the seat of the exercise bike with belts, but this is very uncomfortable. If there is artificial gravity through centrifuges, astronauts can ride bicycles as naturally and comfortably as on earth. In the case of weightlessness, it is meaningless to do weightlifting exercises. Therefore, astronauts use the elastic "fitness belt" to exercise, but because of the new equipment, it is no longer needed in the future. Moreover, exercising in this environment can achieve better results in less time.