First Lady Michelle Obama greets children at the net during a mini-olympics

First Lady Michelle Obama greets children at the net after playing tennis during an event at American University in Washington, D.C., March 13, 2012. Samantha Cameron, wife of British Prime Minister David Cameron, left, joined the First Lady, Olympic and Paralympic athletes, and Washington, D.C., area children in a mini-Olympics competition to celebrate the 2012 London Summer Olympics and the “Let’s Move!” initiative.