Jackknife sit up

You need

How to do it

1. Lie flat on the floor with your legs straight and arms behind your head. Your heels, legs, buttocks, upper back, head, and arms should contact the floor.
2. Take a breath and engage your abs.
3. Simultaneously lift your arms and legs a few inches off the floor.
4. Once you’re in that position, take another breath and lift your arms and legs toward one another. You should raise your legs to a 45-degree angle and have your arms almost parallel with your hands touching your shins. Exhale once you touch your shins.
5. Extend your body back to the starting position without resting your hands or feet on the floor.
6. Take a breath and repeat the motion.