Buttocks consists of three muscles namely gluteus medius gluteus minimus and gluteus maximus. As you lift one foot up and walk these muscle are necessary to maintain the balance. Your body and posture can get stabilized. Try these amazing exercises which will help you to shape your butt. You can do squats: Keeping your back straight and stand with your hands and arms straight in front of you. As you sit in a chair slowly squat in the pose. You can do lunges: With your hands on your hips stand up straight. Forward your foot by taking a large footstep.