Why when hikers are tired is it easier to hold the straps of our backpacks?

Question

When I start a hike, my hands and arms are free and easy. Towards the end I always find them clutching the straps of my backpack. Why?

Edit, for clarity: I always use a waist strap. I’m not talking about using my arms to lift weight off my shoulders. I seem to end up holding my shoulder straps, elbows pointed downwards, almost pulling the backpack downwards onto my shoulders and tighter against my back.

In: 310

Answer 1

IF pack is fitted and worn correctly it would be the same as putting hands in pockets? Arms dangling tire shoulder muscles. Playing football we held on to our shoulder pad straps to take tension off shoulder muscles.