[header] How to do a side to side reach with an exercise ball [title] Put your exercise ball in an open area. [step] You should have plenty of free space to move around, and all sharp/heavy objects should be removed so as to minimize the potential for accidents. [title] Sit down on the ball with your legs pointing ahead of you, knees bent and feet on the ground. 
[step] Walk yourself forward slightly but don't fully lean back against the ball. With your arms resting at your sides you should now be in a neutral position.