Medicine Jack Knife
- Medicine Ball
1) Lay on your back with the medicine ball in your hands - extend your arms behind you. Lift your legs up towards the ceiling so they're around a 45 degree angle.
1) Curl up and lift yourself off the floor by tightening the core - aim to touch your toes.
2) Pause for a second at the top - your body should look like a 'V' at the endpoint. Now, gently lower yourself back to the floor.
Note: try keep your legs as straight as possible.