Black Diamond Forearm Trainer

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Nice stress toy, still in one piece. I've been squeezing this on my way to climb, but I haven't noticed much difference in performance.

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A functional stress reliever for your desk.

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A fun game for warming up, suitably stiff

great

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Good for beginners to improve grip strength. The workout comes without noticing when you're eating this all day long.

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Fits well in a medium sized grip. Works well either when warming up the legs on the way to the crag or for muscle maintenance.

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Fairly stiff, ok for a 6b-7 climber.

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Exactly what a "stress donut" is. A nice thick rim so that the fingers bend naturally and the palm receives the force evenly. A beginner's "must have" for those who embrace compressive strength, a stimulant and initial warmth for the office day.

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A good product for warming up. You can influence the challenge with your own grip. However, it does not offer very high degrees of difficulty, but just right for warming up.

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Maybe a bit pointless though.