I know a lot of CEOs who are looking for three- to four-year varsity athletes - not necessarily because these people are going to be doing pushups or spiking volleyballs in the workplace, but because they're looking for that continuity, that person who was gritty about something.

Negative feelings are typical of learning, and you shouldn't feel like you're stupid when you're frustrated doing something. You might say to yourself, 'I can't do this,' but you should say, 'That's great.' That means you really have the potential to learn something there.

I think the very idea of character, of developing not just grit, but empathy and curiosity, emotional intelligence - you know, the things that I want my own daughters to develop - the idea that we're going to get there through rewards and punishments seems completely at odds with the idea of character itself.

Gritty people train at the edge of their comfort zone. They zero in on one narrow aspect of their performance and set a stretch goal to improve it.