Astronauts aboard the International Space Station must exercise for a minimum of two hours every day. This is to prevent any loss of muscle mass and bone density while living in a weightless environment. NASA astronaut Karen Nyberg demonstrates how crew members achieve this in space.
Astronauts aboard the International Space Station must exercise for a minimum of two hours every day. This is to prevent any loss of muscle mass and bone density while living in a weightless environment. NASA astronaut Karen Nyberg demonstrates how crew members achieve this in space.