Exercise ball
（重定向自Exercise balls）
![An exercise class using exercise balls.](/Images/godic/202501/12/Fitball_Group_Fitness_Class2304.JPG")
![An exercise ball allows a wide range of exercises to be performed.](/Images/godic/202501/12/SwissBallSquat2304.JPG")
![Different types and sizes of balls at ISPO-fair 2014](/Images/godic/202501/12/Gymnastikbaelle_ISPO_20142304.jpg")
![A woman performing weighted sit-ups on an exercise ball.](/Images/godic/202501/12/Weighted_sit-ups_on_an_exercise_ball2304.jpg")
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 ball, ball, fitness ball, gym ball, gymnastic ball, physioball, pilates ball, Pezzi ball, sports ball, stability ball, Swedish ball, therapy ball, or yoga ball.