Exercise ball Exercise ball An exercise 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) and filled with air. The air pressure is changed by removing a valve stem and either filling with air or letting the ball deflate. It is most often used in physical therapy, athletic training and exercise. It can also be used for weight training. The ball, while often referred to as a Swiss ball, is also known by a number of different names, including balance ball, birth ball, body
Nine-ball in a diamond-shaped configuration, with the 1 ball positioned at the front (toward the position of the breaking player) on the , and the 9 ball placed in the center. The physical rack used to position the balls is typically triangle-shaped, usually wood or plastic, and capable of holding all fifteen object balls, although diamond-shaped racks that hold only nine balls are sometimes used. The placement of the remaining balls is generally considered to be random. However, in some tournaments, the ball being to the lesser player must be one of the two balls placed behind the 1 ball at