15-Minute Workout: Barre and Abs Sculpt Session: Butt and Abs May 11, 2016 by Susi May Today in our Summer Shape-Up Challenge, we're serving up two workouts: one for your butt and one for your abs. And we think you're going to love them both. Pop Physique to Reshape Your Backside A No-Crunches Workout to Set Your Abs on Fire