Heavy-duty wall balls are designed for a variety of workouts that stand up to the toughest athletes. The scaled weight range gives exercisers a way to progress and utilize unique functional training techniques. Training With a Purpose Instead of focusing on isolating a muscle, it’s the action--cardio and strength training, simultaneously--that forms the makeup of functional training. It allows exercisers to more easily perform day-to-day activities. That’s why it’s paramount that your equipment is as focused on performance as your exercisers are.