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Gym balls are widely used in physical therapy, athletic training, and fitness workouts. They are ideal for improving core strength, balance, posture, and flexibility. By adding instability to workouts, the ball engages multiple muscle groups, especially the abdominal and back muscles.Common exercises with a gym ball include abdominal crunches, back extensions, planks, bridges, and even weight training routines. They are also sometimes used as a replacement for a chair to encourage better posture and active sitting.