The wrist roller is also a very good choice because it is simple and very effective: Mr. Lacy’s choice here is just a sturdy tree branch with a cord tied to it. You can get more fancy than that if you like but when it all comes down to it, that is minimally all you need.
How does Mr. America build forearm strength? The Wrist Roller, of course. It was a great method then and still a greta method now. If you could peek into the training log of just about every strength champion throughout history, there’s a pretty good chance you’ll find the wrist roller as a part of their respective programs.