Me too posts are frowned upon on HN, but vote counts are hidden so I'll say for others: me too. I developed RSI as a teen from spending too much time at a desk with bad posture and have dealt with flare-ups into my adulthood. They were miserable and some days I had to take off work. Once I started bouldering, it went away within months. It's probably the forced blood flow in the area, but whatever it was helped tremendously. I can still hurt my wrist if I type in a terrible position, but it only hurts a bit and doesn't turn into the sustained RSI I had.