Fitness 75cm Swiss Ball Exercise Fitness Gym Fit Ball - (colour may vary)The gym ball is also known by a number of different names including swiss ball, exercise, pilate's, sports, fitness, stability, therapy, yoga, ball. Gym balls are particularly good for building abdominal & lower back muscles and will also improve your balance, co ordination & flexibility. We have Red, Purple, Blue, Grey and Pink color available, but it will be sent randomly. Thanks. Note: Do not put too much air into the ball when you use it. Product