AlterG

Sean Whalen and his father developed the original prototype of the Anti-Gravity Treadmill in the family garage, using technology developed by NASA to create a treadmill that unweights a user through "differential air pressure". The Nike Oregon Project, runner and coach Alberto Salazar, the Oakland Raiders and the Golden State Warriors tested and used the prototype.

In 2007, the Washington Wizards were the first professional sports team to purchase the P200 model. The following year, the Miami Heat, Golden State Warriors, Chicago Bulls, Houston Rockets, Houston Texans, and Phoenix Suns all purchased the P200 for their training rooms.

In 2008, the U.S. Food and Drug Administration (FDA) cleared the Anti-Gravity Treadmill, which at the time went by the name G-Trainer, as a medical device applicable for uses in rehabilitation. Since then, the AlterG treadmill has been used for rehabilitating lower extremity injury or surgery, aerobic conditioning, weight control, gait training for neurological conditions, strengthening and conditioning the elderly.

Named CEO of AlterG, Inc. in 2011, Steve Basta is a graduate of the Johns Hopkins Biomedical Engineering program. Ten years after acquiring the Tiburon Corporation and adding the Bionic Leg to its product line, AlterG was purchased in 2023 by Israeli company ReWalk Robotics Ltd.

All of AlterG's products are manufactured and assembled at the company's headquarters in Fremont, CA. The company's line of Anti-Gravity Treadmills and its Bionic Leg both use patented technologies.

Differential air pressure

NASA developed the differential air pressure technique as a way for astronauts to exercise and maintain conditioning in space.

In 2012, NASA purchased the P200 model to use for pre-flight and post-flight training of International Space Station astronauts. AlterG now holds a patent for this technology, which employs air pressure to adjust the users body weight on the treadmill between 20% and 100% of normal weight.

A year later, AlterG was named by Fast Company as one of the top 10 most innovative companies in sports for its Anti-Gravity Treadmill. The company's Anti-Gravity Treadmill M320 was cleared by the FDA for use in medical facilities, hospitals, physical therapy clinics, and skilled nursing facilities - like the other models, the M320 can reduce a user's body weight by up to 80%.