GRIPZILLADynamo Forearm Strengthener and Wrist, Comfortable Grip and a Durable Design Roller Perfect for Men and Women - Ideal for Hand, Wrist, and Forearm Strength Training, Workout - Wrist/Arm Builder

Great device for forearm development and pump. This is like a cheaper version of a Sidewinder Pro. Harder to adjust and action not as smooth. Still a 5 star product, but only because the Sidewinder Pro is 6/5 stars and every other wrist curl product I've ever used is garbage.

Got this as a high school graduation gift for my nephew, who is an Arm wrestler that competes regularly. I opened it up and messed with it myself and it’s very easy to use and you feel the burn/pump. Excellent quality.

Great buy

Works as advertised. Once you adjust it to suit your needs you can start burning. I started out only being able to do 30 secs at a time, now only a few days later up to a minute at a time. Will keep pushing!

good

It works as described. It’s a little grainy feeling, but it a great supplement to my forearm workout. I use it in between sets to really get a pump

Honestly, it works great. Has nice build quality and it's easy to understand. The reason I do give it 3 stars is the for usability and how effective it is. Feels more like a gimmick to be using this instead of doing actual forearm workouts with a dumbbell.

I have been using the Dynamo for a little over a week and I have always gotten some amazing results in my grip strength and my forearm size in general in the short amount of time that I have been using it. The fact that it’s so portable makes it so convenient to be able to workout my forearms and my grip whenever I want. I literally probably use the Dynamo 4 times a day and every time I use it, my forearms just feel such an amazing pump. I would recommend this product to anybody looking to enhance their grip strength and who are looking to really get a killer workout for their forearms. I love the Dynamo!!!!