Ok, I don't 100% agree with you there Moa Hunter.
Fitness is usually considered to have several aspects (can't recall all of them off the top of my head)
strength (1 rep max weight lifted)
endurance (often discussed as very short term eg how many reps can you do or else over < 1 hour anyway)
flexibility
Aerobic capacity (VO2 max and anaerobic threshold)
Speed ( depends on muscle fibre type and recruitment)
One aspect never discussed it "toughness" ie tendon, joint and bone strength which determine how much damage you do with hours of walking and pack carrying. This take months and years to gradually biuld up. Look at the hands of someone who has done a lifetime of hard manual work (fewer people nowdays) and they are big and thick. Desk drivers have little delicate touch screeny hands and its not genetic. Delayed muscle soreness (24 after exercise) is something different. i'm talking about tendon pain that builds up over months of overuse and plagues amateur athletes.
The most important aspect for hunters and trampers is "how many hours can you keep walking ?"
This depends mostly on capability for aerobic fat burning metabolism.
And mobilising stores mostly of fat but to a lesser extent total glycogen reserves in muscle and liver.
If uyou have a high anaerobic threshold you can walk faster without using glucose to make lactate. Therefore you don't need to break down so much glycogen to make that glucose. This is where your "oxygenate and provide energy to the muscles at the rate they are getting used up" comes in.
My opinion is that this depends on not exercising too hard and akso training your body to store and release energy over a long period. sounds contradictory, bt eating lower glycaemic food like protein and fat and continuing on till you are quite hungry before eating are the key here. Continuous snacks of glucose and high glycaemic (bread) foods don't stress and develop those metabolic pathways.
As for food types, there is quite a body of opinion now that dietary fats probably don't contribute much to blocked arteries. Vegetable oils are thought to have pro inflammatory effects and synthetic trans fats such as in older style margerines increase atherosclerosis and have largely been phased out. So, animal fats are "in" now. The low fat diet is no good if it is high glycaemic carbohydrate (bread and sugar) as over decades it promotes weight gain. The literature on Paleo diets and lifestyles explains this.
Finally, I think your statement of a year of tahr hunting developing fitness is too short. Too short from scratch in a sedentary lifestyle anyway. It takes 2 or 3 years to gradually build up muscle tendon and bone bulk and longer for maximum aerobic capacity. Your culler probably started from a good base of all round fitness as an outdoor worker before that. You don't have to do much, but you have to do it consistently and over a long time.
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