Very, very underrated movie.
First thing I thought of when the poster made the comment about any biopic seeking out any conflict with a parent and attempting to magnify it, was “Walk the Line’.
Conflict IS the source of drama - but it can get a little out there - thus my SECOND thought was of “Walk Hard” and the haunting phrase “the wrong kid died!”.
The line about training his body and mind made me laugh so hard it hurt!