For example if meditators like to sit in the lotus position and sit for a long time so the natural pain threshold is crossed related to pain aversion it's logical that this skill could be used for any task that requires you to go beyond the comfort zone. I like the example he uses in that when you workout you're goal shouldn't be to get stronger in some future date but instead to get weaker in the present moment. This of course is what happens when you workout. You get weaker, until enough time passes by and you get stronger. So many people exercise while mentally striving for a future healthy self but there would be more willpower energy if people just exercised for its own sake and let the results happen on their own. It's better than some people I see who obsess next to the mirror after each exercise to see if their muscles grew by a fraction of an inch.