The AlterG Anti-Gravity Treadmill is a NASA designed anti-gravity device that allows patients and athletes to walk, jog, and run with reduced stress and impact. Using patented technology to control “differential air pressure,” the AlterG is able to support up to 80% of a person’s body weight. This allows patients to safely begin recovery sooner after an accident or surgery as well as the ability to slowly build to bearing more body weight as they progress through physical therapy.