Work Your Abs in Just 15 Minutes

Move 6: Reverse Crunch

To strengthen the entire ab area, lie on your back and extend your arms out to the side, or keep your hands behind your head if that’s more comfortable (top illustration). Raise your knees and feet so they create a 90-degree angle. Contract your abdominals and exhale as you lift your hips off the floor with control; your knees will move toward your head (bottom illustration). Try to keep your knees at a right angle. Inhale and slowly lower. Repeat 8 to 12 times.