Bootylicious pop star Beyonce Knowles has one of the most coveted bodies in Hollywood, so just how does she do it? Beyonce, 28, dances her butt off -- literally. When she's not performing her high-intensity shows, Beyonce is rehearsing for hours at a time. In fact, prior to touring, rehearsals will regularly last for 12-hours, and she spends the entire time dancing in high heels to prepare for the concerts. But that's not all -- Beyonce also admits to doing "regular" workout things like running on the treadmill and doing squats. She reportedly keeps her abs in shape with numerous crunches, bicycle crunches and planks.

But perhaps Beyonce's best workout secret is that she fits exercise into whatever she does. She admits that she tones her butt and glutes by taking the stairs whenever she can, and she spent a recent vacation with her husband Jay-Z jumping on trampolines and jet-skiing in the tropics. But she's not afraid to take some downtime when necessary too. "Either I'm doing absolutely nothing and relaxing -- reading a book, sitting by the ocean and not answering any questions -- or else I'm hands-on and giving 100 percent, working really hard," she says.

And, of course, Beyonce watches what she eats, even trying controversial juice fasts (for which she apologized later) when she needs to slim down in a hurry.