When I was small, my Grandfather had me stand with my arms hung down by my side with my fingers straight and open palms flat against my pant outer seams with my arms locked and my elbows tucked tight against my sides. After holding that straight arm position for a few seconds, he had me relax my arms and shoulders. When relaxed, my shoulders dropped, the knife edge of my hands rotated away from my legs, and my elbows fell away from my sides with a natural bend. While maintaining this natural shoulder, arm, and hand position, he then had me raise my bow arm/hand to shoulder height and then had me swing my bow arm/hand to my side as if holding a bow in a shooting position. I found that my elbow had a slight natural bend and that my bow hand had a slight natural cant that used bone support without any added muscle tension.
In this one lesson, he taught me how to find my natural cant which I've since used shooting longbows for the last 40years.
later,
DB