Side Jackknife

How to do it

1. 1Lie on your left side on the floor with your legs stacked and nearly straight, your right hand behind your head, and your left arm resting on the floor in front of you for balance. This will be your starting position.
2. 2Exhale as you raise your legs off the floor and simultaneously crunch your torso up toward them, bringing your right elbow toward your hip and contracting your obliques.
3. 3Pause briefly at the top of the contraction, then inhale as you slowly return to the starting position under control.
4. 4Repeat for the recommended amount of repetitions, then switch sides.