(WTVR) - It's important to stay in shape, especially if you're an astronaut.
Experts say you can lose up to five percent of your muscle mass in a week living in an environment with zero gravity.
Now we know how to stay in shape, thanks to Canadian astronaut Chris Hadfield.
Hadfield has become a social media sensation by sharing what it's like to be an astronaut on a day to day basis.
His workout includes:
- Stair steppers