Point your arms straight out (so that your wrists, elbows, and shoulders are aligned). Inhale and you should be in a neutral position.
[header] How to do a knee raise with an exercise ball [title] Take your exercise ball and place it where surrounding objects won't obstruct your exercise. [title] Sit down on the exercise ball with your legs in front of you, knees bent and feet on the ground. [step] Walk yourself forward slightly if you're not comfortable, but don't fully lean back against the ball.