Background in athletics.
Knowledge of what the human body can do.
This is seriously lacking in schools. I have a degree in psychology, but have played sports 24/7 for years. I have played everything under the sun.
My simple CPT certification gives me the ability to work with people. I have worked in a physical therapy office and would be more than happy to match experience with someone with a PHD any time.
Lots of people think the degrees do it. They help, but when push comes to shove someone has to have the knowledge to back up the book.