Astronauts staying at the International Space Station are hardly able to work out their muscles as we can do on the Earth’s surface. This is because of the gravitational pull of Earth that we need to make more efforts to lift our body weight. However, the International Space Station has an environment of weightlessness where a person does not need to make much effort to propel forward. As it is very much required to exercise in order to keep our heart and muscles healthy, astronauts also need to work out to stay fit in space.
