You pay more for the shipping ($4.99) C'est la vie
A primary benefit of exercising with a Bodytrends exercise ball as opposed to exercising directly on a hard flat surface is that the body responds to the instability of the ball to remain balanced.
Increase inner leg and pelvic muscle strength or intensify your ab workouts. Use slightly deflated for best functionality. Made of soft and durable easy-grip vinyl. 9 inch diameter (30 cm).
* Use the stretch upper back and neck muscles
* Soft and durable vinyl ball
* Use to strengthen adductor or abdominal muscles
* Easy to inflate with FREE PUMP
* Exercise guide included