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Anyone else using one so something similar? Great wrist forearm workout, I use it while driving.

I've been wondering what physics causes them to spin up.

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  • 2 weeks later...

Not sure what a dyna flex is. Your post is pretty light on info.


I have a forearm exerciser/flexer thingie that I don't remember what its called. I used it after the bike crash where I had to have my hand pinned back together for a few weeks.

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