Diamond Reverse Crunches

Diamond Reverse Crunches: Lie on your back with your arms along your sides, palms facing down. Bring your feet together and open your knees out to the sides so the space between your legs resembles a diamond. Press into your palms and brace your core as you raise your feet up over your hips. From this position, lift your hips up off the bed to drive your feet straight up toward the ceiling. With control, bring your hips back to the bed. (Don’t drop your feet.) That’s one rep.
Where you’ll feel it: Your lower abs and thighs.