Here's my 2 bits on the theory of relativity. 5'4", 135#, big and nimble footed,  70# pack and a saw. No dead weight, hour glass or not. All with a pistol personality, the shiny ivory gripped persuasion! Roar! ;D

Marten and the others are right Positive Mental Attitude is where it is at. That always carries the important weight; no matter if your a longer larger lever with a tippier center of gravity and a core to surface area that increases over heating. All that stuff is our heads anyways and the trail remains under foot, in the best.