Built to develop grip strength, the adidas Adjustable Grip Trainer specifically targets the forearms and hand muscles. The Trainer features a solid metal spring and durably molded frame. Allowing you to increase not only the strength of your forearms and hands, the Trainer also boosts your muscular endurance, helping you to reach heavier lifts and greater reps without your grip letting you down. Designed with a unique adjustable mechanism, the Grip Trainer can be tuned from 10 – 40 kg of resistance. The Trainer's tension dial helps to avoid training plateaus and allows you to continue to develop your grip strength as you progress. The Adjustable Grip Trainer also features rubberized handles for a stronger grip when applying maximum pressure.