Published on Aug 1, 2013 Do you want to train like an astronaut? Like the Mission X: Train Like An Astronaut Facebook page to follow astronauts as they train for upcoming missions. In space, astronauts experience muscle, bone, and cardiovascular tissue loss. Exercise is one of the primary methods used to counteract the effects of the lack of gravity. Astronauts use a specially designed treadmill called the T2/COLBERT aboard the International Space Station. In addition to cardiovascular fitness, T2 helps maintain bone density.