FITNESS CHALLENGE First Lady Michelle Obama participates in the "pit crew challenge" station during an event with the President's Council on Fitness, Sports and Nutrition on the South Lawn of the White House, May 9, 2011. The First Lady visited seven activity stations during the event, which helped promote both the Let's Move and Joining Forces initiatives. SHARE: Download: Full Size (0.08 MB) Credit: VIRIN: 334746-N-BYF41-046.jpg Photo Gallery