This is a simple product called Sprite Stasis Ball 55 cm

The Sprite Stasis Ball gives you the toned abs, sides, and back you want by amping up your core workout. With bright colors and a burst-resistant design, it's a must-have for every hard-core exercise addict. Use for abdominal conditioning, balance training, yoga, or even physical therapy.

• Durable, burst-resistant design.
• Hand pump included.