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
Three-ball 2 and 3 balls) are racked either in a triangle — usually aluminum, wooden or plastic, like a miniature eight-ball or snooker rack — with the apex ball on the , or in a straight line, again with the lead ball on the foot spot, and the other balls behind it, lined up toward the center of the . No particular arrangement is necessary, as there is no specific order in which the balls must be pocketed, nor do any of them have specific point values. Racking is often simply done by hand, though there have been at least two