Side Jackknife

How to do it

1. Lie on your side with your legs straight, one on top of the other, and rest the forearm of your lower arm on the floor in front of you. Place your upper hand behind your head with the elbow pointing up. This will be your starting position.
2. Raise your top leg and your torso toward each other at the same time, bringing your upper elbow toward your top knee. Your bottom leg stays long on the floor.
3. Pause briefly at the top of the motion, then lower your torso and top leg back to the starting position under control.
4. Repeat for the desired amount of repetitions, then switch sides.