John - with respect, I think a lot depends on how you define "training". I certainly agree with you on the question of effort and practice - which I think is training. Selecting the right key for your voice, understanding a bit how to breathe and where to sing from (stomach, etc.) to get projection and good pitch - all are also part of practice. If you don't know how to do these things naturally, then some tips from one more expert - and good solid listening to other (good) singers is also part of training.