I tell you I have observed people in way better shape, and stronger than me can't handle a bow like I expect one to be handeled.

It is definitely a learned strength.

I started shooting a bow at six or seven, I am 55 now.

In really cold weather I shoot a weaker bow 4 sure. Tree stands also will limit ability to handle poundage.

"Shoot low sheriff, I think he's riding a shetland!" B. Wills