Smart Medicine Balls are a functional fitness staple that should be in every home gym or gym! The weighted center forces the user to use different muscle groups to throw, bounce or twist with the ball, helping to develop core strength, balance and coordination. With the Prism Fitness medicine ball, you'll never be confused on how to use the piece of exercise equipment – 8 exercises are printed right on the ball, making it a great choice for both beginners and those more advanced. For additional variety in your workout, four sizes and weights are available for this medicine ball: 4 lb. yellow, 6 lb. orange, 8 lb. green and 10 lb. blue. This exercise medicine ball is made of sturdy rubber with a textured surface for a reliable grip. It can also bounce on hard surfaces. It's durable and high-quality, ensuring it will last countless workouts. At Prism Fitness Group we believe in the power of movement in the development of mind and body. We are committed to spreading greater understanding of the human body, and the safest and most effective ways to prepare the body for challenges ranging from everyday functional movements to amateur sporting events to a professional-level competition. We strive to create simple-yet-innovative training equipment that can be used to achieve transformative results.