Jack Riley, the author, says he was surprised by their willingness to talk, sometimes with no more inducement than a chocolate bar at the end of the interview.

ECONOMIST: Drug abuse

Similarly, I always used to advocate shaking hands with your host at the end of an interview segment.

FORBES: Befriend Your Host -Media Training

"The objective of periodisation is to play every game with your best 11 players, " Verheijen told BBC Sport during an hour-long interview, following a presentation at the UKSEM sports medicine conference at the end of last month.

BBC: Total fitness from the land of Total Football