Working against gravity, this ab exercise will target your core quickly and effectively. Just be sure to keep a flat back and control the movement with your abs rather than your legs or arms. Here's how:
- Lie flat on your back with your arms at your sides, palms pressing into the floor. You can place your hands under your pelvis if you feel the need to protect your lower back.
- Bring both legs straight up toward the ceiling, engaging your abs and pressing your lower back into the ground.
- Keeping abs pulled in and lower back on the ground, slowly lower your left leg until it's a few inches above the floor, then scissor your legs, lifting your right leg up. This completes one rep.
- Do 15 to 20 reps.