"We used a racquetball and threw it off the wall as hard as we could, then tracked it down with our eyes and feet. Nike has new balls that bounce all sorts of different directions and really help you learn to track the ball and move your feet to react quickly."

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My view on well-being and fulfillment comes from Maslow and positive psychology, and that is that you're satisfying three sets of needs. First need is physiological and safety needs: Got to satisfy those first. And the second is you got to satisfy your community needs because we're social animals, and if we don't have that, we're empty and we don't have people to share knowledge and bounce things off of, and challenge ourselves. And then the third is the idea is to find a calling.

— Charles Koch