In a TED Talk called Flow — The Secret to Happiness, Dr. Csikszentmihalyi explains that when you’re fully involved in the process of creating something, your brain doesn’t have enough leftover capacity to monitor how your body feels. The chatter in your head fades away, and you forget if you’re hungry or tired. Flow (or flow state) is an out-of-body focus that I can only describe as a state of ecstasy in which everything makes sense and you feel zero friction.