The wrist roller is by far the best exercise for developing forearm size and strength. It is to your forearms what barbell squats are to your legs, if not better. There's simply no substitute for this exercise, and if you don't have access to one you can easily make one for around five bucks. Most start off very humbled by the wrist roller and are lucky to use 10-15 pounds or less, but with consistency and applying gradual overload it's possible to work up to some impressive weights. Another huge bonus of the wrist roller is that you must grip the roller to prevent it from slipping in the opposite direction, which works the flexors and develops crushing grip strength. From there, you can either work the extensors by rolling it extension style (you'll be able to go heavier with that form) or continue to hammer the flexors by rolling it flexion style.
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