I work out at a climbing gym and many many good climbers there would completely disagree with you. That is, like every single sport, the main way you get better at the sport is by doing it a lot. Obviously doing lots of climbing is the best way to become a better climber, just like playing lots of football makes you a better football player, playing lots of hockey makes you a better hockey player and so on. However, to say that all other training is not worth his time is a bunch of rubbish. Yes, technique is almost always the primary need in a sport, but you would also benefit enormously from being stronger, having more power, more endurance, better agility and so on. This is why regardless of sport, virtually all athletes do cross training. You can only climb so many hours a day and days per week (especially if you are limited by the time it takes tendons to adapt), so rest of the time can be well spent by improving all aspects of fitness. Many climbers at my gym do Crossfit precisely because it makes them better climbers. It in no way is a substitute for the hours they have to spend on the wall, but all else being equal, the more fit athlete is always the better athlete.
Firstly, I am well aware that top climbers cross train. For example, James Litz, who has put up a V15 first ascent, adds a bunch of lifting to his gym climbing regimen. In addition, he occasionally wears a weight vest while climbing. (As a side note, I've worn his before and with it on, it makes you feel super fatigued, even though you are totally fresh). But this guy is at the top of the pyramid, and what he does to improve/maintain his climbing isn't going to be the same as somebody who is comparably a newbie.
Please understand that I was specifically directing my advice to Gamingphreek, who is an roughly a beginning to intermediate climber and that I stand by everything that I said. Note that I was never negative towards any cardio exercise and even encouraged him to do it on his off days.
You do CF at Planet Granite Sunnyvale don't you? I'm no Mike Abell, or Joel, or Jeremy (V10+ climbers), but on any given night, I'm one of the top tier climbers at PG Sunnyvale. Out of the people that I typically work problems with, I haven't heard of much talk about lifting unless they were recovering from injury, save one guy who is/was a CF instructor.
I will throw in that doing sit-up/crunches/v-ups is not unheard of among the climbers that I know.
By just climbing and biking for training, I've climbed 5.13a and have done V8s in under 45 minutes, on real rock. I feel that I have a good understanding of what it takes to become "good" at climbing, especially when it comes to moving through 10s and into 11s.
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