15-Minute Back and Butt Workout From Sydney Cummings
Cummings brings us a workout with moves specifically for your butt and your back. You'll only need a set of dumbbells, and you'll be doing five rounds of three-minute circuits. Each circuit consists of a back exercise and a butt exercise. For example, you'll have alternating bent-over rows and sumo squats with calf raises for one circuit.