You learn via challenging ideas, trying new things etc.
The NRL strength coaches have players getting non-contact injuries all of the time. I have watched first hand, from 15ft their techniques and implementation of programs. They are have people trying to hold side bridges for 1 min when they cannot hold with good technique for 10secs.
They have athletes squatting with load when they cannot perform a body weight squat.
They are using the same exercises with the players that they used in their playing days.
This isnt the odd occassion, it is the norm.
Have a look at the video on
http://www.adrenalineperformancecenter.com/
There arnt many Rugby or NRL players that could perform like that.
Andrew