June 6, 2012 10:48 am America's Anti-Gravity Track and Field Training A Silicon Valley company is helping athletes train for the Olympic games using a new technology the anti-gravity treadmill. US & World Videos 1:27 Shia LaBeouf's first red carpet appearance in 4 years 2:14 Jennifer Lopez and Ben Affleck seen separately with wedding rings amid tension rumors 1:16 Firefighters rescue dog from bathroom wall 1:34 Chris Pratt's stunt double Tony McFarr dead at 47 1:51 Kim Kardashian and North have girls night out at L.A. Sparks WNBA game