If you are a beginner you might want to put your feet shoulder width ... And those are some exercises you can do in your office or just about anywhere with the ball.
Your feet should be about shoulder width apart ... If you have more than one medicine ball, you might find that you want a lighter one for some exercises and a heavier one for others.
"The shoulder is a shallow ball and socket joint that allows us ... The right Pilates exercises can help protect and strengthen your shoulders, helping to reduce the likelihood of injury.