Takem
WKR
Endurance on a physiological level is capillary density.
The cardiovascular system responds to the demands of your skeletal muscles not vice versa.
If you want to improve endurance you need to increase capillary density in your skeletal muscle. Capillary density is best increased by time out not "sucking wind" doing intervals.
For that matter hunting (rucking) isn't purely endurance. It's strength-endurance.
If you really want to understand how to improve your efficiency in the mountains you need to understand the Strength-Endurance Continuum
Absolute Strength<->Endurance Strength<->Strength Endurance<->Absolute Endurance
If you want to improve any point on the S-E Continuum you have to improve the base which is Absolute Strength
You guys are making some good arguments toward strength training. I've always been in the camp that hiking with weight (maybe throw in a few push ups) is the best way to train for mountain hunting. I'm now 48, not as physical as I once was at work and I'm really feeling like this off season needs to include a lot more strength training. I read the article you posted, along with some others, that discussed the cardiovascular benefits of strength training. Cardiovascular health is high on my list of reasons to train and had been a big part of my preference for hiking over strength training because I thought that was the only way to get cardiovascular benefits. I don't enjoy the gym so I'm going to have to add some items to my garage. Thanks for the information.