Olivia Munn – Best Bikini Bodies

When she's not spending her time acting, Olivia Munn likes to stay in shape. So much so that in 2011, she dropped 16 pounds just getting her groove-thing on.

In a never-ending quest to make working out fun, Munn compiled a 45-minute mix-tape for her and a couple girlfriends to dance to. (Although we think dancing like no one's watching burns way more calories.)

As she explained to Shape magazine, "I make a playlist ... usually ’90s hip-hop. It's just myself and my two girlfriends, and we do it four times a week.

"It's really fun, because it's not just a regular dance routine. We're laughing, and it doesn't really feel like I’m working out ... [but] everyone’s tightening up and losing weight."

Now that's a routine we can get behind. So to speak.