Hi Rick. That is an excellent find. I keep forgetting that Wiki is a legitimate source of information. I hadn't heard of this muscle either till about 6 months ago when they pinned down his problem; all new news to me. And apparently, my partner might be one of the 17% as him and I have discussed most of what you posted before (including the dr. mentioning he might one of the few with sciatica/piriformis syndrome. The thing I hadn't fully understood, but it makes sense, is this "Sitting down, stretching, climbing stairs, and performing squats usually increases pain". He's gearing up to do the nose on El Cap, 32 pitches I believe, and aid climbing is a bit like climbing a ladder slowly. Oh man.

Thanks Rick