Here's how China's astronauts keep fit aboard Tiangong space station (video)
China's astronauts are working up a sweat in orbit with a variety of exercise machines designed to keep them fit and fight the loss of bone density that comes with living in microgravity.
![Here's how China's astronauts keep fit aboard Tiangong space station (video)](http://cdn.mos.cms.futurecdn.net/vtk65DfGqoxWVZy35iJ8ga.jpeg?#)