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/ Source: TODAY
By Chris Serico

Feel the burn!

In response to first lady Michelle Obama's challenge to "#GimmeFive of your best reps" to spread the word on social media about the fifth anniversary of her Let's Move health initiative, Vice President Joe Biden wrangled a 30-pound dumbbell and curled it "a million" times (or so he claimed).

"A million arm curls ✓ Calls with world leaders ✓ All in a day's work," reads Biden's tweet, which includes a 6-second Vine video of the vice president pumping iron with his right hand while taking a phone call with his left — all while wearing suit pants, a button-down and a tie. "Watch VP Biden respond to the First Lady's#GimmeFive challenge."

In the video, Biden takes a break from a supposed phone call to turn to the camera and say, "Yeah, I do a million of these [reps] a day, so, just gimme five."

The first lady took another lighthearted approach when she and President Barack Obama celebrated the anniversary in a YouTube video released last month. She's asking Let's Move participants to list five ways they can be healthier, post them on social media using the hashtag #GimmeFive, and "pass on the challenge to someone else."

Perhaps Biden had just been waiting for someone to ask.

Biden followed up the post with a tweet challenging another vice president — or more accurately, an actress who plays one on TV — to perform the same feat.

"A million arm curls later, we're asking @OfficialJLD to take the #GimmeFive challenge next," he wrote, linking to the account of "Veep" star Julia Louis-Dreyfus.

Follow TODAY.com writer Chris Serico on Twitter.

This story was originally published on March 13 at 5:18 p.m.