A yoga ball, also known as a stability ball or exercise ball, is a large, inflatable sphere typically made of durable plastic. It is commonly used in fitness routines to improve balance, core strength, and flexibility. The ball comes in various sizes to accommodate different heights and can be used for a range of exercises, from stretching to strength training. In addition to fitness, a yoga ball can also serve as an alternative seating option. Sitting on the ball engages the core muscles and promotes better posture. Many people use it in offices or at home to encourage movement and reduce discomfort associated with prolonged sitting.