"When Michael Jordan was well into his career and had already won his first 4 championships, a reporter asked him one question: 'With all these games, travelling day in and day out, leading your team, how do you perform at such a mind-bogglingly high level without fail? How is it humanly possible for you to keep dropping 30 points per game and be such a star?"
"Jordan replied and said, every game I play, I always know that there's someone out there in the stands who's never seen me play before. I go out and play for that guy."
I love this story and can relate to it on a professional level (even though I'm not a pro-basketball player).
It's easy to get caught up in the routine of training, especially when you have a line up of recurring clients who's issues you know, are familiar with, and who you've proven yourself to (which is why they continue to train with you on a regular basis) but it's important as a training coach to view every client (or hour) as 'that guy', the one in the stands who has never seen you play before. That's what's going to make you successful long term, help you keep all of those clients that love you right now and the ones that haven't trained with you yet.
Keep learning, stay humble and never forget that every person who agrees to be your client is an hour you need to earn (each and every game).