What do First Lady Michelle Obama, TV host Kelly Ripa, and ultramarathon runner Dean Karnazes have in common? All three care about helping kids across America get active to get healthy, and all three were on the South Lawn of the White House on Monday. The First Lady brought the special guests to meet with D.C.-area students and talk about the importance of physical activity. Ripa and Karnazes are involved with Run Across America, which holds community runs to introduce everyday Americans to a healthy, fun cardio routine they can do with friends and family. Check it out: