Relax your back on the stability ball back and unwinds during the boat stance.
Available in 5 different sizes 45cm, 55 cm, 65 cm, 75 cm and 85 cm to suit users of different heights (in the range of 150-190 cm). RDX B1 Yoga Ball-Purple-45cm Just release gas and fold ball to store away. Superior quality, toxins-free, waterproof, durable and flexible RDX PVC yoga ball is safe for regular use and delivers high compression of up to 250kg.