Habit expert Charles Duhigg reveals how the habit loop—cue, routine, reward—lets you rewire destructive behaviors without willpower. Sam Parr credits Duhigg's framework with overcoming a 20-beer-a-day drinking habit by substituting M&Ms for alcohol, then replacing that with keystone habits like sleeping in workout clothes. The conversation covers how 40-45% of daily actions are automatic, why systems trump willpower at scale, and the three core skills of super communicators: asking deep questions, matching conversation types, and proving you're listening. About 40-45% of daily behavior operates as habit; neural pathways thicken with repetition, making habits persist even after extinction attempts, so replacement rather than elimination works. Keystone habits like sleeping in workout gear trigger cascading positive changes because they collapse willpower demands into environmental design and automatic behavior.