Grunting also seems akin to swearing, and (occasional) swearing has been proved by SCIENCE* to increase pain tolerance! Climbers can always use more of that.
In fact, in Taekwondo there is even a special term for the force that leads practitioners to shout during their practice: kihap. Evan told me about it just now, and I found a little info on the Taekwondo Wiki: … More Pss-AT and Kihap: Thoughts on #tryhard sounds
In retrospect, it seems awfully silly; when I started climbing, I was the weakest of the weak, and I had less bodily awareness than a 12 year old boy. I could barely unscrew a peanut butter lid. I opened “pull” doors by gripping the handle with both hands and leaning back on my heels with all my body weight. I lacked the hand-eye coordination to catch a basketball from 10 feet away, and I truly could not walk a straight line. Why I expected to be some kind of rock-spider prodigy is beyond me. … More V5 in a year? Expectations of ascent