I'm preparing to be blasted, ripped, fried, and flamed for what I'm about to say...be gentle. Strength, flexibility, agility, endurance...all very important. Mental fitness...also important. I'm not taking anything away from anything anybody has said here. Here it comes...Fat is not necessarily a bad thing in a survival situation. I'm not talking Jabba-the Hutt, grotesquely obese, huge sheaves of sweaty fat. I'm just saying, don't train away all of your fat. It can be an important energy source, layer of protective warmth. Go to a Ranger School graduation and you'll see what I mean. Most of these guys, already quite fit to begin with, lose quite a bit of weight during the course. They're putting out huge amounts of work without getting nearly enough calories and the energy had to come from somewhere. Another example, look at the people that engage in longdistance coldwater swimming (hey, everybody needs a hobby). They actually eat very high-fat diets but under the "blubber", they're every bit the athlete that an olympic swimmer is.
Maybe I'm just trying to justify my current conditioning regimen...sorry...(sob)...just a moment of weak self-esteem...I need a hug