The Athletic Works 25.6 inch inflatable body exercise 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 abdominal and lower body strengthening and toning exercises. At a diameter of 25.6 inches, this exercise ball is recommended for people 6 feet tall and under. Includes workout guide and air pump!