In the days of treadle lathes, it wasn't uncommon to have a rail (often brass) placed in front of the lathe so that the operator could lean on it while treadling, some others, ie. the Barns Velocipede lathe that had an iron seat attached to the lathe (sort of tractor seat style).
With my Varicose veins, I just limit my time standing, so production is down.
Ian S C