To develop that big flexor/pronator belly, you need to use wrist flexion. Really heavy wrist curls bother a lot of my lifters' wrists, so we usually go for sets of 8-plus and seek a pump rather than maximal strength.
Wrist rollers are better suited for heavy wrist flexion, and this version is especially challenging since the resistance increases as you roll.
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You hear it all the time. It's one of the favorite sayings from high-intensity pundits and other "briefer is better" trainees.
If you've only been training for a couple of years, just about anything you do in the weightroom will make you stronger. However, those of you who have been training a bit longer need to pull out the heavy artillery.