I am going to have to check out 'The Inner Game of Tennis' -- I feel like you've mentioned it before, or at least it rings a bell. Very similar to golf, when you think about it. I love your spirit, by the way -- "who knows if I can get marathon training going in the winter. If not, so be it." :) I too have learned to observe -- the older I get, I realize how little I actually "know" :)