My son is doing a year of “Industry” before university and he’s working as a personal trainer in a gym

My son is doing a year of “Industry” before university and he’s working as a personal trainer in a gym. <br>He spent the first 3 months learning all the equipment, now is invited to sit in on personal training sessions. <br>One of his first instructors spent 45 mins with a middle aged lady before finishing off the session.<br>He was then asked if he would walk the lady to her car with a few equipment bags. <br>She smirks at him and says “I would have been happier for you to have trained me as the guy is burnt out”