1. Position your hands either behind or next to your buttocks, with your palms facing down toward the floor. Throughout the exercise, keep your legs straight and your knees locked together.
2. Raise your feet toward the sky, and try to get your legs as vertical as possible. Hold for 3 seconds then gently lower them to the floor.
3. Repeat these steps until your reps are complete. If you need more resistance, you can place a bag on your feet.