I'm glad particular attention was given to the gym example in this article, or more in general "health".

These days I'm generally quite disciplined with sleep and exercise, but I've been down that path of "if I skip the gym this time I'll have more time/energy to work". After a few days I find I'm much less productive than I am when I'm consistently going to the gym 5-6 times a week. It's a nice reminder.

I wonder how many successful entrepreneurs are highly disciplined about their exercise/health?