This workout burns more calories than even your best spin class.

Your mission, should you choose to accept it, is to survive Angela Parker's Power Hour.

Once you've signed up for the intense 60-minute workout, await further instructions--the precise meeting place isn't disclosed 'til the day of class, but it's in the vicinity of the Santa Monica stairs. (It's all part of Parker's sneak-attack plan so you'll never get bored.) 

Parker also keeps your mind and muscles guessing with an ever-changing combo of running, stairs, lunges, push-ups, cartwheels and more. 

Classes are limited to ten people and you can wear an iPod programmed with your own tunes or Angela's Power Hour playlist--check out her picks here.

The class may be hardcore, but we promise that Parker's supportive and sunny manner will keep you motivated. 

Making the impossible possible.

Have a friend who's a fitness survivor? Send her this tip.