Astronauts have to exercise daily to prevent bone and muscle loss during long stays on space stations, but I assume this is all in preparation for when they return to the normal gravity of Earth. If it was certain that a person was going to spend the rest of his life in a microgravity environment, would these exercises be necessary? Would there be any harmful effects or deterioration eventually?
closed as too broad by kim holder, Fred, TildalWave, Hohmannfan♦, GdD Mar 23 '16 at 8:57
Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.