Bikini-Body Secrets from the People Who Know Best. "Hit pushups and wall squats before donning your bikini. When working out for even just 10 minutes, your muscles pop and stay that way for up to one hour! This will give you great definition on the beach. And remember, there is nothing sexier than confidence!" —Jolene Matthews, Celeb Master Trainer, Sky Club Fitness and Spa, Hoboken, NJ