Start sitting in a chair on a smooth surface, heels on a towel. Grip hands around the seat and lift off the chair, butt elevated and spine straight. Keeping arms straight, lean forward so torso and legs form a 90-degree. In a slow, controlled movement for 4 counts, flex feet and pull the hips up toward the ceiling. On the 4-count-out, push the hips down and feet forward.
For an added challenge, add a triceps dip in between reps.