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Usher

If you wanna scream, yeeeeah, let him know and he'll take you there! Usher couldn't have looked more hot while practicing his boxing moves in mid-July. "Getting ready," the singer wrote on Instagram. For what, we wonder?!

Celebs Sweat It Out at the Gym

Celebrities just love to take pictures of themselves and post them on social media. And there's a certain group that derives pleasure from showing off the results of their hard work at the gym for all the world to see. Check out our gallery of sexy stars getting fit and fabulous — you'll be glad you did!