The shoulder is the most often injured body part in CrossFit workouts. That’s probably due to how shoulder intensive most WODs can be.
That’s just to name a few. Quite honestly, if it involves your arms, the rotator cuff is probably involved.
The shoulder is not a weight-bearing joint. In other words it’s not like the hips or knees which are designed to take stress everyday. Therefore we need to show our shoulders some love to help keep up with the demands of CrossFit.