A Swiss ball, also known as a stability ball or exercise ball, is a large, inflatable sphere used for fitness and rehabilitation. Typically made of durable PVC, these balls come in various sizes to accommodate different heights and exercises. They are commonly used to improve core strength, balance, and flexibility. In addition to fitness, Swiss balls are often utilized in physical therapy settings to aid in recovery and rehabilitation. They can be incorporated into various exercises, such as squats, planks, and stretches, making them versatile tools for enhancing overall physical health and stability.