The Unofficial Guide to Overcoming Infertility . Most use a 65-cm ball. For example, the exerciser may balance her abdomen on the ball while resting her hands on the floor for push-ups. Making sure the back is straight, the exerciser leans slightly forward from the hips, with bent knees. Once in position, the exerciser balances on the ball while performing exercises such as push-ups, leg raises, pelvic tilts, leg curls, etc.
Pros Improves flexibility and balance.
Permits extensive stretching. Tends to target the lower back and abdominal muscles, and so may be particularly helpful for these areas. May help with strengthening. Cons Balancing on the ball can be more difficult than it looks, and so performing exercises properly can be challenging. Some positions may be unsafe if the exerciser loses her balance.