Exercise Essentials Fitness balls

Some forms of fitness training are based around a large inflated ball. Sit on it to practice balancing, lie over it prone or supine for sit-ups, back extensions, and push-ups. Or lie on the floor raising legs against the ball to isolate action in one set of muscles and prevent larger, more often used muscle groups from taking over. Do attend a class to learn the basics with a trained instructor, since balls are fun but can be challenging to stay on.