Massage balls are small, often round tools used for self-massage and muscle relief. They come in various sizes and materials, such as rubber or foam, and are designed to target specific areas of tension in the body. By rolling the ball over sore muscles, users can alleviate tightness and improve circulation. These tools are popular among athletes and fitness enthusiasts, as they can help with recovery after workouts. Massage balls can also be used for relaxation and stress relief, making them a versatile addition to any wellness routine. They are easy to use at home or on the go.