The Valeo 55 cm balance/body ball makes a great addition to your everyday workout routine to improve strength and posture. It can be used for a wide range of functions; from a desk chair to an apparatus for your weight training routine. The design provides a low-impact method for working on Ab and lower body strengthening and toning exercises. The 55cm model is designed for people 4'11 to 5'3" tall. Each box includes a wall chart illustrating step-by-step exercise program and a high volume air pump."