What it is: A barre-based workout blended with intervals of cardio, strength-training, stretching, and recovery. "Cardio, strength-training, and stretching combined with our formula of interval overload creates long, lean supple muscles in the shortest period of time," Tanya Becker, Physique 57 co-founder, told us.
Why we love it: The first workout will leave you achingliterally. The method works by targeting certain muscle groups to the point of fatigue, and the results are visible almost immediately. Our waists felt instantly chiseled after the abs portion of class, and our thighs were still burning days later. More at physique57.com.Read MoreLess