Exercise balls, also known as stability balls or Swiss balls, are large, inflatable spheres used for various fitness activities. They come in different sizes, typically ranging from 45 to 85 centimeters in diameter, and are made from durable, burst-resistant materials. These balls can enhance core strength, balance, and flexibility when incorporated into workouts. Using an exercise ball can improve posture and engage multiple muscle groups during exercises. They are commonly used in physical therapy, yoga, and pilates, making them versatile tools for both beginners and experienced fitness enthusiasts. Proper inflation and size selection are essential for safe and effective use.