Heel raises are excellent for developing a rounder butt. You can use ankle weights or resistance bands to maintain tension for better muscle growth in the glutes and hamstrings.
1. Begin on your hands and knees in a tabletop position. Drive the heel of one foot straight up towards the ceiling, maintaining a 90-degree angle at the knee. At the top of the movement, take a second to flex the glute muscles as you exhale.
2. Inhale as you slowly bring the knee back down, crossing it over the opposite knee.
Tip: For a more intense workout, do 1 to 2 minutes on one leg, then continue with another 1 to 2 minutes on the same leg, but this time extending your leg straight out. Once this 2 to 4 minute set is complete, switch legs."
You can read more and see photos on their Cosmopolitan website (click on cosmopolitan to go). When you start to see results make sure you thank me!lol