Besides developing good overall muscle tone for your entire body, an Exercise Ball provides numerous other benefits to improve core stability, posture and muscle balance, making it the perfect fitness and yoga training aid. While they are somewhat of a new craze in the public domain, the exercise balls commonly known as Stability Ball, Fitness Ball, Swiss Ball and Physio Ball were used as early as the 1960s. It was originally used by physio therapists to assist rehabilitation. Inexpensive, exercise balls are highly versatile and offers a total body workout while also improving balance and core strength. There are literally hundreds of different fitness and Pilates exercises that can be used with the exercise balls . And the added benefit? It's suitable for all ages and levels of yoga, Pilates, fitness and weight loss.