Reverse Crunch

How to do it

1. 1

   Lie on your back with your knees bent and feet off the floor — hold your knees above your hips, arms flat by your sides.

2. 2

   Breathe out as you curl your knees toward your chest and lift your hips slightly off the floor.

3. 3

   Breathe in as you lower your hips back down slowly — don't let your feet touch the floor.

4. 4

   That's one rep — keep the movement controlled and repeat.

Where you should feel it: Your lower stomach.