You'd better bet your booty that it's time to break out that bikini, and chances are, you still have a little work to do before you feel comfortable strutting your stuff in that bathing suit. In fact, according to SHAPE magazine, four out of five women aren't satisfied with their bodies, and so SHAPE is offering the SHAPE Bikini Body Tour to help sculpt you in time for beach season.

The magazine is touring the country and hitting two of the hottest beaches to provide women with a chance to take part in 40 classes, games and prizes. One of the sexiest bikini models around is lending her name (and her body) to the effort, too -- Victoria's Secret supermodel Marisa Miller was at the first stop of the tour last weekend in Santa Monica, California, and she is on the cover of SHAPE's June issue, hitting stands May 25.

The next stop of the tour occurs in Miami's South Beach on Saturday, June 13. Preregistration is simple and only costs $10. Considering you could take part in a really cool class and have the opportunity to win fab prizes (like a free trip to one of two Beaches resorts), it sounds like a pretty good bargain to us.