HOW: Begin by laying on your back for this exercise, knees over hips and hands over shoulders- with a swiss ball in between both. Then bring your hands and knees together by squeezing the swiss ball. Slowly drop one leg and the opposite arm to the floor.
FEEL: You will be feeling this in your core especially as you squeeze the arms and legs together.
COMPENSATION: Avoid allowing the low back to arch as you perform this exercise.