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What is the Alter G Antigravity Treadmill and how does it ... · The Alter G Anti-Gravity Treadmill® is a trusted, leading-edge rehab and training equipment using NASA Differential Air Pressure technology. It was originally created for astronauts at the International Space Station to help enable them to exercise for hours each day to combat the loss of bone mass and muscle in microgravity. The Beginners Guide To Anti-Gravity Treadmills The Cost of Anti-Gravity Treadmills. By far, antigravity treadmills are the most expensive treadmills on the market. The price of an anti-gravity treadmill varies depending on the features of a…