I read the article and did some quick Wiki-checking into Rhabdomyolysis. 6 occurences per 100,000 people. (according to the article you linked)
It is 6 occurences per 100000 people in base population, but much higher among people who do CrossFit. That was exactly the point of the article:
And here we have arrived at CrossFit’s dirty little secret. The coach was unusually familiar with what is normally a very rarely seen disorder. It’s so rare that one study reported the overall annual incidence of rhabdomyolysis to be 0.06%. (...) How, I wondered, is it possible that the layperson exercise instructor is on a first-name basis with a serious, yet rare medical condition? Is this a thing with CrossFit? It turns out it is.
It is 6 occurences per 100000 people in base population, but much higher among people who do CrossFit. That was exactly the point of the article:
The claim that rhabdomyolsis is more frequent in CrossFitters is the question you and Nancy appear to be begging. We have nothing other than anecdotal evidence to support that.
I think it is rather self evident that injuries that result from over-exertion will tend to result at a higher frequency during activities with high levels of exertion.
The criticism seems to be from people who are unfamiliar with the purs...
Here's an internal dialogue I just had.
Q: How do we test rationality skills?
A: We haven't come up with a comprehensive test yet.
Q: Maybe we can test some part of rationality?
A: Sure. For example, you could test resistance to akrasia by making two contestants do some simple chores every day. The one who fails first, loses.
Q: That seems like a pointless competition. If I'm feeling competitive, why would I ever skip the chores and lose?
A: Whoa, wait. If competitiveness can cure akrasia, that's pretty cool!
Now we just need to figure out how to make people more competitive in the areas they care about...