as great Post and sound slike a good day, knowing the finishing line is in sight and mentally being there already is always a good thing
My answer to your question I believe its a combination of both, but your Mental Strength is far more important, without it you will stop well before your physical strength may run out
I also believe that mental strength is extremely important. I find that a lot of successful people are not smarter then me or better then me, but they have the right mental strength and confidence to believe in themselves. Thanks for your nice feedback !
Yes you stated that very well