The Sacramento Angels invested in Alter-G in 2007. They develop and market anti-gravity treadmills and have found markets with major league sports teams worldwide and more recently, rehabilitation facilities. Their most recent Series B venture capital round came from Versant Ventures in early 2009.
This month there is an online article in Scientific American about the company, its products, and its origins in NASA. Take a look; there is a compelling story within the article about an Iraq veteran rehabbing on one of the company’s treadmills.