Barry's Bootcamp

This celebrity-endorsed boot camp, which has slimmed and toned the likes of Kim Kardashian and Jake Gyllenhaal, was a natural fit for South Beach with its slew of sexy trainers (famous in their own right) and taut-and-trim clients whose good looks only rival their stamina in class. Workouts are broken up into sections—treadmill and weight training to target different muscle groups happens simultaneously—and are led by tough but encouraging instructors who remarkably keep tabs on both halves of the class without ever skipping a beat. If 30 minutes of running at top speeds wears you out, recharge at the juice bar before crawling back to your car.