A yoga ball, also known as an exercise ball or stability ball, is a large inflatable ball used for various fitness activities, including yoga, Pilates, and general exercise routines. It is typically made of durable PVC material and comes in different sizes to accommodate users of various heights and fitness levels. Yoga balls are used to improve balance, stability, flexibility, and core strength by engaging different muscle groups during exercises performed while sitting, lying, or leaning against the ball. They are versatile fitness tools commonly found in gyms, yoga studios, and home exercise spaces.