Despite its followers' devotion,
Robert Hayden, a Georgia-based chiropractor, says that he has seen an uptick in patients who participate in CrossFit.
"I see people who do CrossFit more for routine maintenance than the general population," he says. "People come in with injuries from repetitive use of extremities. For example, some of the CrossFit exercises involve jumping onto boxes of increasing height, and that can be pretty tough on the low back, the thighs and the knees."
Richard Lustberg, a New York-based sports psychologist, adds that some participants get addicted to the rush of the challenge.