>>2340001Strong back
Strong legs
Good cardio
So, uphill sprints, squats, deadlifts and farmer walks. No need to overcomplicate this shit, the stronger you are, the lighter the loads you carry become, and the better your cardio... yeah you get the idea this isn't rocket science.
Also, since you're asking retarded questions, I'm assuming you're a retard, so make sure your shoes are worn in properly, no amount of training and preperation will save you from the fuckin BLISTERING.