Enjoy better posture and a comfortable seat! Sitting at a desk all day can be tough on your body, but this ball helps strengthen your core while you work. Stability ball helps promote good posture while sitting at home, work or school. Designed to develop trunk and abdominal muscles to build a strong core. Also a great tool for stretching and exercising. Made of burst-resistant Italian resins for strength. Built-in legs help prevent unwanted movement. Backed by the manufacturer's 60-day limited warranty.