adidas Classic 3S 4 Backpack, Jersey Onix Grey/Black, One Size

This high-quality nylon exercise ball is perfect for any high school student looking to improve their fitness and posture.

With a diameter of 11.5 inches, this ball provides ample support for core workouts and can be easily inflated with an air pump.

The ball's compact size makes it easy to store in a dorm room or backpack, making it the perfect accessory for any student on-the-go.

Plus, its lightweight design makes it easy to move around and adjust to different angles for optimal comfort and support.

Don't miss out on this amazing product - order yours today!