What qualifications and degrees does your "coach" have? I'm guessing at most she has a personal trainer certificate, which you can essentially get by mail after watching videos.
You're right and she's wrong. Exercise on an empty stomach doesn't have any benefits, and if you're getting dizzy and faint, it's harming you. In fact, I had to read what you wrote a couple of times to understand it, not because it didn't make perfect sense but because we almost always hear the opposite-- people say that they don't like to eat before their workout or they don't have time, but everyone insists they *should* eat breakfast first. Eating 1-2 hours before a workout is ideal, in fact, because it gives time for the body to start breaking down what you've eaten before you start, making the fuel available when you need it.
Encouraging you to work out for over an hour when you haven't eaten for the previous 8-10 hours is NOT good practice. If you've told her that it makes you feel dizzy and hypoglycemic and she still insists, that's downright irresponsible.
If this coach is brilliant at teaching you new exercises with good form or at motivating you to try harder, then keep her on for that, but ignore her nutritional advice. If this is just one item on a list of things you disagree about, though, it might be time for a new coach.
| current weight: 132.0