I recorded football coaches at the University of Dayton during their pregame speeches and interviewed those coaches afterwards; I also interviewed a coaching graduate assistant at the University of Cincinnati via email. The recording of the pregame speeches took place before a home game on a Saturday afternoon. In the pregame speeches, Coach Kelly and Coach Whilding attempted to bring out the best in their players.
The author is using different coaches to understand the teaching methods of each one of them. He's doing this by gathering information via recording, interviewing, and emailing the different coaches.