Slideshow: Michelle Obama kicks off summer exercise series

First lady Michelle Obama stands with Shellie Pfohl, right, executive director of the President's Council on Physical Fitness.

(AP Photo/Carolyn Kaster)

First lady Michelle Obama laughs as she plays with kids at an event on the South Lawn of the White House, Tuesday, May 25, 2010, in Washington, to kick-off the South Lawn Series.

(AP Photo/Carolyn Kaster)

First lady Michelle Obama plays with kids at an event on the South Lawn of the White House.

(AP Photo/Carolyn Kaster)

First lady Michelle Obama plays with kids at an event on the South Lawn of the White House

._(AP Photo/Carolyn Kaster)_

First Lady Michelle Obama plays with kids on the South Lawn of the White House.

(AP Photo/Carolyn Kaster)

First lady Michelle Obama plays with kids at an event on the South Lawn of the White House.

(AP Photo/Carolyn Kaster)

First Lady Michelle Obama plays with kids on the South Lawn of the White House.

(AP Photo/Carolyn Kaster)

First Lady Michelle Obama runs on the South Lawn of the White House in Washignton, Tuesday, May 25, 2010, during an event to kick-off the South Lawn Series.

(AP Photo/Carolyn Kaster)

First lady Michelle Obama runs an obstacle course at an event on the South Lawn of the White House, Tuesday, May 25, 2010, in Washington, to kick-off the South Lawn Series.

(AP Photo/Carolyn Kaster)

First lady Michelle Obama plays with children at an event on the South Lawn of the White House, Tuesday, May 25, 2010, in Washington, to kick-off the South Lawn Series. The South Lawn Series are summer activities happening at the White House to promote physical activity and engage children from the DC community in support of Let's Move!

(AP Photo/Carolyn Kaster)