Exercise balls, also known as stability balls or Swiss balls, are large, inflatable spheres used for various workouts and physical therapy. They help improve balance, core strength, and flexibility. People often use them for exercises like crunches, planks, and even as a chair alternative to promote better posture. These versatile tools come in different sizes to accommodate various heights and fitness levels. Using an exercise ball can make workouts more fun and engaging. Additionally, they are often used in rehabilitation settings to help individuals recover from injuries by gently strengthening muscles and improving coordination.