Balance balls, also known as stability balls or exercise balls, are large, inflatable spheres used for fitness and rehabilitation. They are typically made of durable PVC material and come in various sizes to accommodate different heights and body types. These balls help improve core strength, balance, and flexibility by engaging multiple muscle groups during exercises. In addition to fitness, balance balls are often used in physical therapy settings to aid recovery from injuries. They can also serve as an alternative to traditional office chairs, promoting better posture and reducing back pain. Overall, balance balls are versatile tools for enhancing physical well-being.