Lying Butt Lifts

Lie flat on your back on a mat with your knees bent and your arms at your sides. Feet should be hip distance apart.
Slowly raise your pelvis up toward the ceiling to a point where your body will be at about a 40- to 45-degree angle relative to the floor.
At the top of the movement, be sure to really flex your butt for one second — try to make it a long second.
Now slowly return to the starting position to complete one rep.