As I've mentioned before, the body and the mind are deeply connected. The things you think affect how you feel, and how you feel affects how you think.
What happens when you feel terrible all the time? If you're always lethargic, you'll never have the willpower to do those things that will bring you greatest
I'm fascinated with potential. When I am given a new task I'm focused on the potential of the idea. When I'm writing code I'm focused on the potential for reuse and maintentance. When I'm debugging I'm focused on the potential speed or functionality improvements I can create. It's all about drawing out maximum potential.
Most programmers are, at least to some degree, familiar with Top-Down design principles. The 3-10 rule applies human nature to the top-down design rules, creating a substantially improved method for project generation.