It is true that the effort and time you put in to reach your goals often determine the outcome or ‘success’ if you wish to call it that.
Since I train clients with medical problems quite beyond their control, I am usually guarded to talk about success as a curve that always goes up. I have clients where staying where they are at the moment is the goal, and more effort does not equate to ‘success’ beyond that status. I also train people where we can only hope for a delay in getting worse.
Even though I like nothing better than being the cheering section, I have a more differentiated view on the meaning of ‘success’.