1. Lie with a Bosu ball under your hips, your knees bent and your hands by your temples.
2. Curl up into a crunch, twisting your torso to the right.
3. At the same time, lift your right knee and touch it to your left elbow while straightening your left leg
4. Go back to the start and repeat the action on the opposite side

Using a gym ball allows you to stretch your abs more than stretching on floor would. With the ball underneath your lower back, relax your abs and stretch your arms out over your head. Gradually increase the pressure on the muscle for 15-30 seconds without bouncing. This is an incredible move and you feel results immediately. We recommend a slow start and finish – do not rush yourself back up as you can risk an injury pull – bring yourself off the ball slowly and return to full standing posture.