I'm not trying to be a smart ass P, but how many of you ever played football? How many of you were any good?
What the fuck does that have to do with anything?
Pacells never played football.
Bellicheck never played football.
Al Vermeil has won more championships than any other coach in any sport. he is a strength coach. he hasn't played the sports that he trains people for.
Most strength coaches have played one or two sports in their time, that doesn't mean they don't understand how to properly manipulate someones training. You need to understand biomechanics, human movement, energy systems, joint angles, etc..
Not to be a smart ass, but how much physiology have you studied?
Because you played football that makes you qualified to know how to train someone for it? Look at how many high school football coaches have shitty weight training programs because they (a) don't understand what they are doing and done understand the human body and (b) they just do whatever the person before them did or what their coach did when they played.
Why do you think that coaches in the NFL hire a strength and conditioning coordinator?
Louie Simmons didn't play football but he still is a strength consultant for several NFL teams.
Boyle never played hockey but he still trains lots of NHL pros.
Bill Hartman doesn't even have a passion for golf, yet he is one of the most in demand strength coaches for that specific sport, based on the fact that he understands movement and can apply it to training specifically for the task.