First lady Michelle Obama ate lunch with local students and star athletes Michael Phelps, Nastia Liukin and Justin Tuck at a D.C. Subway Thursday. At the event Obama announced that the restaurant chain will be joining the Partnership for a Healthier America (PHA) for its largest marketing campaign to promote healthier choices to children. (Casey Capachi/The Washington Post)

First lady Michelle Obama and a handful of star athletes spent Thursday morning at a Subway sandwich shop near the White House as the restaurant chain announced a three-year collaboration with the Partnership for a Healthier America.

Gold-medal Olympic swimmer Michael Phelps was spotted getting a pat-down before entering the restaurant before the event. Former gymnast and Olympic gold medalist Nastia Liukin and Justin Tuck of the New York Giants were also in attendance.

PHA is an independent group that works in conjunction with Obama's official "Let's Move" initiative to combat childhood obesity. More details about the event are coming soon on She the People.

PostTV's Casey Capachi produced the video.