Recently I started strength training. I do barbell squats, deadlifts, bench press and overhead press. The object is to get stronger, not body building. I do low reps and strive to always add more weight every single time. I do barbells so that they are full-body compound lifts, not machines that isolate muscles. Full-body strength is what you need for backpacking.
Wow, what a difference it is making! Last weekend I loaded up water for the 3-day weekend and dry-camped and cut brush on an old trail for 2 of the days. Water plus tools plus my lightweight gear (12lbs or so.)
From what I understand of how this works, (and how it works better than just doing lots of hiking, cycling or running) is that lets say your maximum 1 rep squat is 100lbs. Every footstep with your pack is a fraction of your one-rep max, let's pretend it's 0.1%. Double your 1 rep max to 200lbs and now every footstep is half as much effort for you, only 0.05%. You should have both better endurance and have an easier time carrying the load because it's simply less work for you.
I am finding this to be the case for me. Being stronger feels like carrying lighter gear. Being stronger feels like the way you feel when you know you aren't going to get injured because the load is too heavy. Being stronger gives me that nimble feeling you get with a lighter pack even when your pack has 7 liters of water in it.
Probably lots of you already knew all this but I've never lifted barbells before.

