The constant practice and strength required to draw longbow cause bones of left forearms of the archers to become thickened, so that skeletons of archers on ancient battlefields can be readily recognized.

As far back as the Assyrians, longbow archers wore a covering over left wrist, because the least carelessness could result in bowstring causing grievous damage to volar (inner) surface. Allegedly the Amazons were so named because they amputated right breasts to avoid injury from bowstrings. End of trivia.