'I see confidence as something that's rooted in how we feel before any words, something which touches on sensations.'

What do you think of when you think of sports coaching? Elite lean performance machines preparing to break records?

Mike Porteous has competed and coached at elite level as a triathlete, but he believes that coaxing new swimmers from the shallow end is just as important an act of coaching as taking an elite to a new world Ironman time.

His vision of coaching is centred on confidence - and all the messy, emotional reality that surrounds human ambition, at whatever scale. To allow people to go beyond what they believed themselves capable of - in sport and in life - the coach needs to build confidence in three directions: the athlete's confidence in their own ability, the athlete's confidence in the coach, and, crucially, the coach's confidence in themselves.

There's an obvious parallel to the book-writing process, and the slow-burn confidence demanded of authors to grapple the uncertainty and believe that their message is worthwhile. If you're involved in coaching, in whatever capacity, and particularly if you're writing about it, this is for you.