George Zottman (pictured at left) was a Philadelphia strongman in the 1880s/1890s. In this photo Zottman, aged 57, still had massive forearms by any standard - measuring 16 1/2 " here. Relaxed they were still a suitably impressive 14 1/2 ".
It's fitting then that the movement he is most famous for - the one that to this day carries his name - is the Zottman Curl.
This is a dumbbell bicep curl with a twist - quite literally. The weight is curled using the standard supinated (palm facing up) grip, with the wrist angled back slightly so as to make the bicep do all the heavy lifting. At the top of the curl the wrist is straightened and the hand rotated 180 degrees, before being slowly lowered to the start position. The hand is then rotated 180 degrees and the cycle begins again.
This movement succeeds in working both the biceps and forearms, and is a great way to warm up the entire arm.
An uncommon, but highly effective, movement.