Yoga balls, also known as exercise balls or stability balls, are large, inflatable spheres used for various fitness and rehabilitation exercises. They come in different sizes, typically ranging from 45 to 85 centimeters in diameter, allowing users to choose one that fits their height and needs. These balls help improve balance, core strength, and flexibility. In addition to fitness, yoga balls are often used in physical therapy to aid recovery from injuries. They can also serve as an alternative to traditional office chairs, promoting better posture and reducing back pain. Overall, yoga balls are versatile tools for enhancing physical well-being.