 The risk of injury associated with CrossFit training has been a controversial question since the program's popularity began to climb in the early 2000s.Critics have accused CrossFit, Inc. of using dangerous movements and inappropriate levels of intensity, and allowing underqualified individuals to become CrossFit Trainers.In response to these criticisms, CrossFit, Inc. claims, “CrossFit is relatively safe even when performed with poor technique, but it is safer and more effective when performed with good technique.” CrossFit, Inc. also claims the risk of injury can be reduced by properly scaling and modifying workouts, a concept taught on its website and at the CrossFit Level 1 Trainer Course.