lifeasheimagined: A Butt Exercise Worth Doing. The Bridge Burner Workout Addition. Focus Areas: works back, chest, thighs, butt and hamstrings. Step 1: From the starting position on your back bend one leg and put all the pressure in your resting heel and lift one leg straight up. Step 2: Squeeze your glutes and lift your butt off the ground by driving your weight down your resting heel and at the same time you’re lifting your arms with your elbows locked and your hands meeting over your chest. Do 10-15 repetitions on each leg.