Most coaches pay tuition fees in universities and study for a period of time before they come out as coaches, and their bodies are average.
Of course, what I teach is just so-so, because no matter how much I learn, I have never experienced it myself. How should I teach? I still recommend those with certificates and figures! As for your health, at least you have to take part in a fitness competition!
What protein powder, written teaching materials, recommended salary for you,
I'm afraid what I recommended to you is a fake.
Believe it or not, weigh it yourself,
Personal opinion, don't read it if you don't like it!