When you need a great tool for a complete body workout, Heavy Medicine Balls are a smart choice. Use them to strengthen shoulders, back, arms and legs, as well as improving strength and joint integrity. Also used as exceptional abdominal exercise tool for powerful and rock hard abs. Many users find medicine balls superior to limited weight machines, because they provide weight-resistance through a full range of motion, better replicating the unique demands of an actual sports environment. Add Heavy Medicine Balls to your school's training program and see your players' improved performance, less risk of injury and stronger abdomens and lower backs.