Side Jackknife

How to do it

1. Lie on your side on the floor with your legs stacked on top of each other. Place your lower arm on the floor in front of you for balance and place your upper hand behind your head. This will be your starting position.
2. As you exhale, raise your upper leg and bring your upper elbow toward your hip by contracting your obliques. Tip: Try to bring your elbow and knee as close together as possible.
3. Hold the contracted position for a second, squeezing your obliques.
4. As you breathe in, slowly return to the starting position.
5. Repeat for the recommended amount of repetitions, then switch sides.