The Stork Seesaw exercise works your back, abs, hips, butt, quads and hamstrings.
Balance on 1 leg and with the other knee forward then slowly squat on your balancing leg as you bring the bent leg behind you and your body hinges forward. When your back is parallel to the floor and your foot is in line with your back, return to standing. Place your hands on your hips to make this easier. Do 12 reps, switch sides, and repeat. Do 2 sets total.