A Physio ball, also known as a Swiss Ball, is a ball constructed of soft elastic with a diameter of approximately 35 to 85 centimeters (14 to 34 inches). The body responds to the instability of the ball to remain balanced, engaging many more muscles. The greatest benefit of moving an exercise onto an unstable surface is achieving a greater activation of the core musculature.
Bolster is also used for many exercises of core activation. Primarily used in treating Toddlers with Cerebral Palsy.
A Physio Ball with Bolster