I do sports therapy consultations on the side of my karate training. Currently I have four clients, all of whom got hurt doing CrossFit. They went to different facilities but all were taught very poor form. Their "instructors" didn't do screenings (medical questionnaires, posture assessments, biomotor ability testing etc), fitness testing, or adhere to sports training principles to any respectable degree. CrossFit should replace the 'F' in its name with 'Sh'.