The Black Diamond Forearm Trainer is a super strong rubber ring that you squeeze and squeeze, and when you've finished squeezing, squeeze again. Keep doing this and you'll soon have the strength and stamina to conquer that project. A great aid to training and warming up.
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Very good for training your forearm or for warming up before longer climb, but unfortunately it looses it's elasticity quite fast. I didn't notice when using mine for about 1 month, but when I got a new one for a friend, I felt a huge difference.
For its price, it's probably the best you can get.
Simple to use but still gives you a really great pump really quick! So simple there's nothing to break most importantly.
Would definitely recommend for those longer crimpy/pumpy climbs...definitely a great everyday training aid.
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