Some very good points. In summary, every person is different and a good trainer will identify your body type and develop a plan around it.
I was surprised and it makes 100% perfect sense after watching many seasons of Biggest Loser. The girl who had issues and was a battle to train so dropped her as a client. You lose the business, but it really plays a mental game in your head… and in the end most come around and start pushing themselves. Just like a mother eagle dropping it’s baby to fly on it’s own.