The term anti-gravity can lead to thoughts of space. Dr. Robert Whalen, a NASA engineer worked to develop technology to help astronauts exercise in space to counteract the effects which lead to bone and muscle loss. His son Sean looked to create anti-gravity on earth, leading to the concept of the anti-gravity treadmill in 2005, which uses air to lift or off-load the user’s body weight. Initially, the treadmill was used by Olympic runners, the NBA, the NFL, and at universities for their athlete’s rehabilitation and performance training. Now, it is found in physical therapy clinics for rehabilitation for patients that would benefit from decreasing body weight on their bones, joints and soft tissues.