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Black Diamond
Forearm Trainer

4.470588235294118 out of 5 stars
34 Reviews
Color:One Color



Why We Like The Black Diamond Forearm Trainer

From crimpy projects to chilly shaded crags, we pack along the Black Diamond Forearm Trainer to warm up before hopping on the wall. Giving this rubber ring some squeezes prior to pulling on rock helps keep our fingers and elbows happy, staving off send-killing injuries.


  • Convenient forearm trainer for warming up
  • Rubber construction holds shape and strength
  • Compact size fits discreetly in your pack
  • Item #BLD1021
Claimed Weight
climbing training
Manufacturer Warranty
1 year

Overall Rating

4.5 based on 34 ratings

Review Summary

1 Stars - 1 reviews
2 Stars - 1 reviews
3 Stars - 2 reviews
4 Stars - 7 reviews
5 Stars - 23 reviews

What do you think about this product?


Selecting an option will reload the available reviews on the page
4 out of 5 stars

February 22, 2024

Great for my forearms!

After using this for a couple times, I can tell my forearms are already adjusting. Really easy to grip, great resistance, and fantastic results. One thing that I would've liked is the opportunity to stick all your fingers in the middle of the donut and use finger strength to expand it: that's pretty niche but otherwise it's a perfect product for me!

Ian O.

Originally reviewed on

5 out of 5 stars

July 12, 2023

Great little forearm trainer

I keep this on the coffee table to work out a little bit while I’m watching tv. Overall it’s a great trainer: light, compact, and effective. Would buy again.

Brian F

Originally reviewed on

5 out of 5 stars

June 8, 2023


Purchased for my son to work on his grip. We both enjoy them as he get ready for climbing. I higly recommend.

Victor J.

Originally reviewed on

5 out of 5 stars

May 1, 2023

Give me strength

great trainer for the fore arms. My elbow feels much better after using it. Thanks

Terry J.

Originally reviewed on

5 out of 5 stars

February 20, 2023

Great side item

I use these in my middle school class as achievements gifts. Kids love them! Great size. I’ve tried cheaper ones online but they are generally much smaller.

Jeff R.

Originally reviewed on

5 out of 5 stars

October 8, 2022

Effective for beginners

I noticed some strength increase after a couple weeks of 15-min per day training. I imagine at some point I will have to upgrade to something with more resistance but for now this is surprisingly efficient.

Georgina L.

Originally reviewed on

5 out of 5 stars

July 17, 2022

25% Grip Strength Increase!

Each year I have a comprehensive medical / physical evaluation through my employer. One of the tests is my grip strength. It is taken annually and over the last ten years it has averaged 55kg. I started using the Black Diamond Forearm Trainer about three months before my last physical. I did 15 reps on each side for three total sets, five days a week for three months. At my last physical, my grip strength had increased to 69kg!! I am not a climber and bought the Forearm Trainer for the sole purpose of increasing my grip strength and improving my forearm definition. It has definitely worked for me, and I highly recommend the trainer for anyone looking to increase strength and / or improve the look of your arms.

Gabriel D

Originally reviewed on

5 out of 5 stars

July 17, 2022

Nice arm workout

Very practical but a little soft. I use it in the car while driving since you can perform many repetitions

Alberto M

Originally reviewed on

4 out of 5 stars

July 17, 2022

Fun for fidgeting

Got this to fidget with…will it make me stronger? Proudly not. Is it fun to fidget with? Yep

Shane H

Originally reviewed on

3 out of 5 stars

July 17, 2022

Once you get to a certain point it no longer becomes a viable tool because its simply not tense enough for intermediate to expert level climbers.

Cody C

Originally reviewed on