Great excerpt from the book:
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I've been re-re-re-reading it, myself. There's a great story from Tony Yaniro - a very strong climber/coach. He relates a story I thought was very relevant to climbing with a pack: when training for what sounds like a reality adventure race (something he himself says was sort of silly), he wanted to make his then climber body able to compete with some of the other contestants that were coming from a xc ski background - and he may be looking for a little bit of a shortcut with training in re: time.
So, he donned a heavy pack, and did workouts, hiking up mountains. In the race itself, he still couldn't beat the xc skiiers - they fly past him, breathing heavily, while he just hunkered behind, relatively comfortably. The takeaway is that he trained himself to work at the speed he was hiking, regardless of weight.
Now, since you're probably hiking with that pack still on (Tony didn't race the race with the heavy pack), that something to consider - you won't get faster just by carrying a heavier pack. You may find better results simply by doing your training at a faster pace, with a pack, or without.
I thought this was a great insight, since Yaniro is also known for putting pure strength on a pedestal -
I mean, look at the guy in his prime! In technical climbing, strength can most often trump pure endurance, since if you can't pull the difficult/technical/strenuous move, there's no use for any endurance you may have for the rest of the route. (Steve's book does go into how strength training can fit into endurance training - getting all these puzzle pieces together is one of the best things about his book!)
I think the book is great, but maybe slightly irrelevant for most of the 14ers. I do think it's food for thought when it comes to the more technical/dangerous 14ers: one of the thing it stresses is that being in good good aerobic shape gives you a good source of endurance, when things go sour or unexpected.