The concept of the never ending well of will power! Go for that extra lap, extra set or last rep. This is what it means to push through the struggles of your own design so that the struggles of the rest of the day mean much less.
Try to surpass yourself daily. Even the times when you have already given it all and feel like there’s nothing left. Those times when you say to yourself “Enough, I have done enough for today!” Those are the exact times when it is advantageous to push through as long as you can do it safely!
Do this daily, routinely with discipline and adequate rest in between and watch the well that you draw from grow deeper and deeper. Only with time and consistent dedication will you be able to watch the fruits of your labor, be it a goal or a dream or lifestyle that you envision for yourself. If you falter in your routine, strive to get back immediately. Play hard, but plan to play the long game!