Ball Exercises for the Abs and Butt
Lie down on the floor and rest your ankles on the ball. Keep the palms down on the mat.
Proceed to slowly raise your hips up until your trunk and thighs are aligned. Contract the abs and butt for 1-2 seconds, just enough to lift your hips a couple of inches further; relax and lower the hips a couple of inches without changing your stance. Repeat 10-20 times.