蜜芽传媒

Filmmakers Ben and Gabe Turner discuss their encounters with Usain Bolt's coach, having made a new documentary following the Jamaican sprinter.

Gabe said: "The only two people that have reduced me to that kind of fear are him (Glen Mills) and Sir Alex Ferguson.

"They give you a look, an accusatory look, when you first meet them that suggests that unless your game is so high, unless you're bringing absolute A-game to the table please don't waste their time."

The brothers were allowed unprecedented access into all facets of Bolt's life, both on and off the track.

They later realised that Glen Mills was on their side, after he defended them whilst Bolt was training.

This clip is from Afternoon Edition on 22 November 2016