People who live in weightlessness receive tremendous gravity when they return. They can't stand up well because their bones are weak and their blood flow goes down. There is one way to minimize it.
You exercise when you are traveling in space.
Astronauts exercise for two hours every day to get fit.
People who live in weightlessness should exercise well so that they will not be in trouble later.
If you see this homepage and don't want to be subject to strong gravity, please click here.