Dr. Dave Tilley:
… Many coaches were once athletes and may have had pre-existing shoulder issues themselves.
Certain spotting positions and habits might be a contributing factor for the risk for shoulder injuries …
There are some ways to combat the risks mentioned above through education and preventative rehabilitation (using rehabilitation techniques before an injury occurs) …
Thinking Point #1: Only Using One “good side” To Spot Skills
Thinking Point #2: Spotting skills with too much distance between you and the gymnast
Is The Way You Spot Setting You Up For a Shoulder Injury? (Part I)
Gymnastics Coaching.com 