In a blend of precise speed, rogue physics and downright insanity, stunt drivers Tanner Foust and Greg Tracy have done what plastic track-obsessed kids have dreamed of for years: the Double Dare Loop. At this past weekend’s X Games in Los Angeles, California, the two drivers simultaneously traversed a pair of 66-foot-tall loops at an exact speed of 52 MPH, managing to pull 7 Gs as they ran up and over the two life-sized tracks.