The U.S. Marines have led Kate Upton through a workout in Detroit that left the exhausted supermodel on her back in the grass.
Upton struggled a bit at the end, but was able to complete Tuesday's training routine that involved a series of aerobic exercises and running as her fiance, Detroit Tigers pitcher Justin Verlander, watched from afar. Upton joined several other Tigers players' wives and significant others in the session at Wayne State University's athletic complex.
The workout, which Upton says was "very hard," was led by a Marine Corps fitness instructor and designed to promote Marine Week Sept. 6-10, in Detroit. When it was over, the three-time Sports Illustrated swimsuit issue cover model collapsed to the ground in an embrace with a fellow workout warrior.