Why do astronauts exercise every day in space?

Astronauts exercise in space every day. Do you know why? Because when astronauts go into space, their bodies will undergo a series of adaptive changes. Human muscles begin to contract, but they can't resist gravity. Strength will be greatly weakened, resulting in a decline in muscle mass. Blood circulation is not affected by gravity, and it will flow more to the upper body and brain. Without gravity, people's bones will be lost quickly. Bone cells regenerate and develop slowly, and bones become fragile. With the extension of flight time, the situation will become more and more serious.

To be a qualified astronaut, we must not only have excellent comprehensive physical fitness, but also endure various harsh environments in space. After many astronauts return to Earth, the need to learn to stand again is closely related to bone loss. Even in weightlessness, astronauts can exercise for two hours every day. This is a way to help astronauts reduce muscle atrophy and bone loss.

In space, human bones and muscles will change to some extent. Once the spinal muscles are relaxed, people's natural height will increase, which will affect the stability of the spine. The sky is different from the ground. Unusual muscles are now the key muscles. For example, the strength of the upper arm is more important than the strength of the ground. When standing on the ground or sitting on the ground, people say that "feet should be steady", while in the air, upper limbs should be used, and the moving position should be grasped by hands. We all need to strengthen the exercise of these muscles.

Astronauts must work in space every day. Due to the severe weightlessness in space, their daily actions are very inconvenient. Diet needs to be squeezed out like toothpaste, and so does drinking water. People who stay for a long time will have muscle atrophy and osteoporosis. Therefore, in order to prevent these phenomena and make themselves more energetic in their work, space astronauts must exercise for two hours every day.