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Let's Move! -- First Lady Michelle Obama's initiative to end childhood obesity within a generation -- just turned 4.

We're celebrating all week, and we want you to join us.

The First Lady wants you to share how you're moving by using the hashtag #LetsMove on social media to share a photo of your favorite activity or healthy snack. If enough people get involved, President Obama and Vice President Biden will share how they get moving, too.

To kick off this anniversary week, First Lady Michelle Obama and comedian Will Ferrell held a "focus group" with young kids to talk about how they eat healthy and get active.

Frankly, it was adorable. And there's more great stuff coming all this week.