Thinking about doing some daily or almost daily wrist roller training with different volumes but the same weight. It should Popeye my arms a bit, increase their work capacity, speed recovery and grow up my thumb pads even more for arm wrestling. That's my theory at least. Time to test it.
2-3/8" Wrist Roller - F/E
25# x 5/15 - fairly easy. Really feel the extensor direction in my thumbpads.