Lunges are great workout for perfect butt and hips. It strengthens your lower body muscle overall including your calves. Stand up straight, holding your dumbbells down at your sides. Take one big step forward with your left leg, and then plant your foot firmly onto the ground. Slowly bend your both knees, your right knee should bend and touch the ground and your left knee should form a 90-degree angle( as shown in image). Stand back up and repeat it with the other leg. You may begin with a set of 2, each consisting 20 reps.