Former FLOTUS Michelle Obama reveals how to get her toned arms

Michelle Obama isn't afraid of a little sweat.

The former first lady has long been an advocate of healthy eating and exercise. While in the White House, she initiated the "Let's Move Campaign", broke it down with Ellen DeGeneres on the dance floor, and of course went viral for her healthy take on DJ Snake's "Turn Down for What" song.

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She's constantly encouraging people to get active, break a sweat and live their best lives. After all, those Michelle Obama arms didn't come from just anywhere -- she had to work for it. And in a recent Instagram post, she revealed just how.

See more of her incredible arms:

The former FLOTUS explained in the post that she often hosted fitness boot camps for her close friends on the White House lawn.

"Our bootcamp weekends were a reminder that if we want to keep taking care of others, we need to take care of ourselves first. And even though I'm no longer at the White House, I've continued this tradition and wanted to share some photos," she wrote in the post.

From the photos, it looks like planks, squats and crunches might be the key to Michelle's toned arms.

She's has long been a proponent for fitness -- but her arms have been a big point of deliberation for critics all around. In 2009, she caused an "uproar" for choosing to go sleeveless in her first official portrait as first lady. Many criticized her for showing too much skin.

But many also complimented her bold style move and the eventual impact it had on one of her core missions during her time in the White House. "The Obama effect has been that women of all ages have been inspired to take responsibility for their health and their body," said Rylan Duggan, a personal trainer, to CNN in 2009.

And clearly, the Obama effect still stands today.

Inside Michelle Obama's fitness campaign: