The astronauts exercise exercises for long hours until their muscles do not become inactive when they return to Earth
With the lack of gravity in space, flowing blood and other body fluids in the body of the astronauts to the head, causing a feeling of suffocation, headache, and with the lack of gravity become bones and weak muscles will not be used to pay things, so the astronauts to exercise exercises for long hours so as not to become their muscles inert when they return to Earth.
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