Now, American scientists are planning to design a device called "space wheel" to help astronauts do fitness exercises. They hope that this kind of exercise equipment can not only strengthen the muscle exercise of astronauts, but also ensure the health of astronauts' cardiovascular system.

The astronaut "space wheel" who is participating in the health experiment project is like a big centrifuge, with a rotating shaft in the middle, a bicycle-like device at one end and a platform at the other. Once the astronaut gets on the bicycle, the centrifuge starts to rotate, and both the bicycle and the platform swing outward. According to the rotation speed, human centrifuges can produce 0? 5~2? Five kilograms of artificial gravity. At this time, an astronaut does a "bicycle" action at one end of the space wheel, and an astronaut on another platform can do another squat action.