This is from 2005, but still interesting:
Mr. Glassman, CrossFit’s founder, does not discount his regimen’s risks, even to those who are in shape and take the time to warm up their bodies before a session.
“It can kill you,” he said. “I’ve always been completely honest about that.”
But CrossFitters revel in the challenge. A common axiom among practitioners is “I met Pukey,” meaning they worked out so hard they vomited. Some even own T-shirts emblazoned with a clown, Pukey. CrossFit’s other mascot is Uncle Rhabdo, another clown, whose kidneys have spilled onto the floor presumably due to rhabdomyolysis.
New York Times: CrossFit: Getting Fit, Even if It Kills You
This is also interesting: