CrossFit is a popular fitness trend popping up in both neighborhood gyms and trendy metropolitan locations across the country (and around the world). Since its launch in 2000, CrossFit programming is now used in over 7,000 affiliate locations around the world.  Along with its rising popularity is the concern for an increased incidence of a condition called “rhabdomyolysis”, muscle damage and potential acute kidney failure due to extreme exercise. Read more.