Well, I typically would NOT tip a personal trainer or a coach.
I did tip my running coach though, as a Christmas bonus. I decided to do it... ONLY because:
1) I cancelled 3 of our scheduled meetings. 2 on the day of. Now, I did pay for one of those missed meetings, and I even offered to do it, he didn't ask... and he let me slide on the other 2.
2) He cuts me a SERIOUS DEAL on my coaching. I would suspect I pay half what others might pay for these hour sessions.
Because of those 2 reasons, I gave him a $30 "Christmas bonus" with a card. Although, I think he thinks I gave him a $70 bonus as he might have forgotten my promise to pay for 2 sessions when we met today, vs. just paying for 1.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"