The SMAI Pilates Ball / Chi Ball is a soft, pliable inflatable ball designed for extensions and progression of Yoga and pilates exercises. The SMAI Pilates Chi Ball is a versatile, lightweight, and soft inflatable ball, designed to enhance your Pilates workout. It's perfect for providing resistance, improving balance, and enhancing coordination. Its textured surface ensures a firm grip and added comfort. Typically used in three ways: Core Strengthening: Place the ball between your thighs or ankles during Pilates exercises to engage and strengthen core muscles. Balance Training: Incorporate the ball into balancing poses to increase stability and improve posture. Flexibility and Stretching: Use it as a support tool to deepen stretches and aid in flexibility exercises, particularly for the back and hips. Specifications: Diameter: 45cm Circumference: 90cm Colour: Dark Grey/Black Requires inflation - Pump not included, manual inflation only. Do not use an air compressor. Do not over inflate, ball is designed to be used soft and allowing deforming - this is normal. Ball may deflate over time. Do not over inflate. Ball should be soft and allow deforming when used.