How often do you find yourself using willpower when you’re trying to change your diet, or get in an exercise routine, or implement a better sleep schedule? I’m guessing a lot. 

I have to choose to get up early to make myself a healthy breakfast.

I have to choose not to eat the donuts my coworker brought to work today.

I have to choose to go to the gym at the end of the day instead of flopping off the couch.

I have to choose not to reach for that big bag of chips when I...