Derek Hough Bares Biceps at Zumba Class in NYC!

Derek Hough is all smiles as he hosts a Zumba class on Thursday afternoon (April 25) at the Children’s Aid Dunlevy Milbank Center in New York City.

The 33-year-old World of Dance judge bared his killer muscles in sleeveless, black T-shirt as he surprised Boys & Girls Club of America employees with a class.

PHOTOS: Check out the latest pics of Derek Hough

Derek recently teamed up with Zumba Fitness to kick off “Zumba Breaks” – which is a global movement that encourages millions of people around the world to take 10-15 minutes out of their day to get up and move — leading up to May’s Mental Health Awareness Month.

10+ pictures inside of Derek Hough hosting the class…