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
Nessler ball Nessler ball The Nessler ball, or balle Nessler, is a type of muzzle-loading musket bullet. It was developed to increase the accuracy and range of smoothbore muskets and was used in the Crimean War. The Nessler ball was a short conical-cylindrical soft lead bullet, with a conical hollow in its base. The bullet was designed with a lead skirting. Its intended purpose was to expand under the pressure and obturate the barrel and increase muzzle velocity. A similar ball design called the Chace ball (after its inventor W.B. Chace) was developed in 1861 in the United States but was not