The medicine ball is a great tool for a complete body workout. It can be used to strengthen shoulders, back, arms and legs as well as improving core trunk strength and joint integrity. It also makes an exceptional abdominal exercise tool to create powerful and rock hard abs. Unlike weight machines that are bolted to the floor and give a limited unnatural movement, medicine ball workouts provide weight-resistance through a full range of motion. The medicine ball is a unique tool to learn and train sports specific and explosive motion exercises, therefore the medicine ball is used by many professional athletes, boxers, golf and tennis players and sports associations including the NBA, NFL and NHL. The Heavy Weight Pro Style Leather Medicine Balls feature: A top grain leather cover Cork and nylon blended fill Inverted seams and nylon sewn Weight: 11 - 12 Lbs Limited Lifetime warranty against defects in material and workmanship