Prone Jackknife

Technique

Start in a pushup position and place your shins and the tops of your feet on a stability ball. Hold your hands a little bit wider than shoulder wideness and keep arms straight. Tighten your abs, hold the back straight and bring your knees towards your chest. Squeeze abs as much as you can and slowly roll the boll back to starting position.

Tips

Tighten your butt also to make it easier to hold the balance. Keep abs tight the entire set.

Alternatives

Stop and return at half way, when your knees point towards the floor.

More info

Works all abs muscles.

Video

Caroline Nilsson is your personal trainer showing you how to do Prone Jackknife.

This exercise is 1 of 50 exercises that are included in the app Poworkout Ball & Band.