Wilkie-I've seen a few Personal Trainers and instructor giving "bad" advice, I'm a fairly keen runner, fairly fit, gym user, 57 year old who trains with some of the top people in the fitness industry and the stories they tell of so called "Qualified" people is quite interesting. So, like all disciplines, whether you have pieces of paper or initials after your name, it doesn't matter, there are good instructors and bad instructors.