This handy Alien Trainer from Y&Y is perfect for training your hands and fingers, improving their strength and durability. Being a pocket-sized tool, it\'s perfect for exercising on the go or outside during climbing or mountaineering training.The Alien Trainer works by providing resistance as you squeeze, flexing and extending the muscles in your hand and fingers. It even works as a finger trainer for instrumentalists or non-climbers looking to strengthen their hand, arm and finger muscles.Balanced exercise of the hand, finger and arm musclesImproved grip strengthReduced risk of injuryPocket-sized ideal for using on the goMedium resistance Works for climbing training, rehabilitation or general hand strengthening