Front lunges are one of the absolute best exercises for your butt. To start, stand up straight with your hands on your hips. Take a big step forward with one leg, bending at the knee, until your knee is at a 90 degree angle. Step back. Repeat 15 to 20 times with each leg. A side lunge is very similar to a front lunge, only instead of stepping directly forward with one leg, you’ll go forward and to the right (with your right leg) or left (with your left leg). Whew! It’s hard to keep your balance!