Tone your core and work on your balance with the Tone Fitness Anti-burst Stability Ball. It s an effective solution for core conditioning balance training and spinal stabilization. You can strengthen your abs back and buttocks without having to go to the gym. The Tone Fitness stability ball features a durable burst-resistant shell and is made from an anti-slip material for a safe and comfortable total-body workout. The Tone Fitness Anti-burst Stability Ball is especially suited for performing core exercises.