(WTVR) - If you've ever had a joint replacement, you know coming back from that type of surgery is pretty painful.
But a machine designed to help astronauts, is helping those on earth mend without a lot of discomfort.
It's called an Anti-Gravity Treadmill. By pumping air into a sealed clear bubble, and adjusting for the person's weight and injury type, patients feel like they are walking or running on air, which takes away the pressure on the joints.
The treadmill was originally designed by NASA to help astronauts train for zero gravity conditions.