I can just say that attempting to even begin learning to play bass guitar had me exercising the fingers for two–three hours before they stopped feeling like woo

I can just say that attempting to even begin learning to play bass guitar had me exercising the fingers for two–three hours before they stopped feeling like wooden sticks on the strings. Almost every day. I.e. mashing the keyboard is no workout at all. This means, however, that a typewriter would likely noticeably exhaust a modern keyboard jockey, though not in eight characters (hopefully). But dunno about teletypes.