Black Diamond Forearm Trainer, The Black Diamond Forearm Trainer is a simple and inexpensive training tool for your forearms. The Forearm Trainer can be used during your warm-up or at any other time of the day when you have one hand free. The Forearm Trainer is easy to carry in your jacket pocket and will not get in the way on your desk.Easy trainingThe Forearm Trainer is easy to use in your warm-up before climbing or when you have a hand free when you are not are climbing. Intensive training with the Forearm Trainer is comparable to climbing multiple routes, ideal when you want to train but can't climb.Additional informationWeight: 112 grams