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Get stronger with the Black Diamond Forearm Trainer.

Though Black Diamond's Forearm Trainer looks like a dog chew toy, it works surprisingly well at giving you a good forearm pump when you can't go climbing. Stash the Forearm Trainer in your desk at work or at home. Keep your arm strength up by squeezing it with each hand until you have good Coke bottle forearms, and you can barely type on your keyboard.

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Review Summary
37 4
17 3
4 2
1 1

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Black Diamond Forearm Trainer

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Here's what others have to say...

2 5

not enough

  • Familiarity: I've put it through the wringer

I was existed when I first got this products but it is not enough for any one who seriously wants to train there grips strength passed it around the local gym and found out there are similar products that are tougher product works great just not a work out

5 5

Good 'nuf

  • Familiarity: I've put it through the wringer

I got this thing to use as an exercise after climbing, and for while I am studying/watching tv/whatever. It works really well for its purpose. Not much to say, you just squeeze it. It has held up to daily stress really well. It will develop some marks/discoloration, but has not broken. When it gets rubbed against anything, the rubber will be a lighter blue. I didn't find the smell bad at all. When it first comes it has that "new tire" smell, but it wore down to a light rubber smell after a few days. It does what it is meant to, and holds up well. Great stress buster.

5 5

Looks like a dog toy...

But, it's a human toy! Great for keeping up that forearm and hand strength. No complaints thus far.

Responded on


4 5

Strong Like Bull

  • Familiarity: I've used it several times

Just got this to quell boredom while staring at a computer screen all day. I love it, but I agree with previous reviews, it's got a strange and strong smell. Despite the odor, it's the best and cheapest of it's kind on the market - you won't regret that 6.95.

5 5

Smells Funny, Works Great...

  • Familiarity: I've put it through the wringer

I spend some of my time at a computer desk, and every hour I do a short regimen of pushups, sit ups, etc to keep me from feeling (and looking) like a guy who works at a computer desk. I use this trainer to work on forearm and finger strength daily while at work. The only negative - it smells VERY strongly of rubber. On Monday when I walk into my office it is an overwhelming smell. I have started to keep it wrapped in a towel in a drawer overnight and that helps.

5 5

Good little tool

  • Familiarity: I've put it through the wringer

I bought this tool for long trips in the pickup, as I travel for work. I mainly use it to maintain finger strength when I can't hit the hangboard for a bit. It will become a little easy after about a weeks use, but there are plenty of ways to get crafty and work the fingers. If you're looking for a forearm pump, I'd suggest a hangboard.

4 5

I like my blue donut!

  • Familiarity: I've put it through the wringer

After a pretty serious hand injury, I bought this to help regain grip strength - it definitely helps build endurance in the forearm, giving you an edge when it comes to arm pump.

Protip: if it gets too easy too squeeze, put it in the fridge and cool it down - the colder the rubber, the more resistance!

Funny smelling rubber, but I'm kind of picky about things like that. It's not bad at all.

5 5


Cool little fun way of giving your forearms a warm up/cool down. Use it to relieve stress or just as a mini off day 'work out.' the price is great! Keep in your car for when in traffic or on your way to the climbing gym. How can you not enjoy it, you just grab and squeeze!

5 5

Love this thing!

  • Familiarity: I've put it through the wringer

I keep this at my work desk. It's a great way to to get in a quick little forearm workout. It's not as hard to squeeze as I thought it would be, but I just do extra reps to make up for it

5 5

Simple and functional

I think it is a great trainer/stress reliever! I used it while I underwent surgery and was not able to climb. It kept my forearms fit.

Simple and functional
5 5

Pulley Injury Recovery? Use This!

  • Gender: Male
  • Familiarity: I've put it through the wringer

I got this to help warm my fingers up while slowly recovering from multiple pulley injuries. They weren't tears, but at the time I couldn't put a lot of weight on my fingers, and having this to help bring blood into my fingers made a big difference before pulling on any plastic or rock. Never underestimate a good warm up.

5 5

Always in my school pack

Great for staying awake and alert in lectures. Its harder to get pumped using this than climbing because its not as fun but definitely a good time killer.

5 5

Quick and easy to use

  • Gender: Female
  • Familiarity: I've used it several times

This product is a great way to get a quick pump in where ever you are. I'll pull it out while I am sitting in traffic or when I get some down time at work.

5 5

Great for casual and seasoned alike

  • Gender: Male
  • Familiarity: I've put it through the wringer

I don't climb as often as I would like, and sitting at a desk on a computer doesn't always exercise the muscles you really need on the rocks. So I picked one of these up and I use it whenever I have time or a free hand. I just keep it on my desk and run through some pretty basic exercises.

It's probably the best thing I could have done for my arm fitness.

5 5

Hand Strength

Not the most difficult strength device out there, but if you do lot's of reps or try just using finger tips it is much harder.

5 5

Squeeze: The story of the rubber donut

Works just like it's advertised. Hold it and squeeze.
Mine is stashed in the passenger seat in my girlfriends car to so I can relieve my stress from her driving.
Also, nice way to warm up your forearms on the way to the crag/boulders/fight club.
Builds your strength enough to open those hard to twist Smirnoff Ice bottle caps after that tough day keeping your dog from walking underneath falling climbers

5 5

Works As Designed

Works well, maintains decent but not super hard resistance, doesn't crack or break, and is convenient. I like it so much I just ordered a second one.

5 5

fun to squeeze

i use the red one of these puppies at work an it feels great if i find myself typing for an extended period. muscles starting to cramp a bit? take a quick break and squeeze this thing a bit. feels much better as well as giving a bit of a workout if you use it for a while.

3 5

squeeze all day

These fit well in your hands and work alot of muscle in the fingers but i just wish they were a little harder to squeeze ... i take it to class and work but i find its hard to get really pumped off this, but its something more than nothing and it helps keep consistant on the wall. All and all it dose what it says it dose.

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