The two will be at a high school in Watertown, Wis., on Thursday for the event, which is a part of Obama's Let's Move! anti-obesity campaign.

Longoria is a prominent Obama supporter who addressed delegates at the Democratic National Convention and raised funds for the president's reelection bid.

The first lady will also spend time with military families this week.  

She will visit military children at Fort Belvoir, Va., on Wednesday, the anniversary of 9/11. She'll also stop by Intrepid Spirit One — which provides care to veterans suffering from traumatic brain injury, Post-traumatic Stress Disorder and related conditions — and meet with Wounded Warriors.

She will also participate in the moment of silence at the White House Wednesday morning.