Kelly McGonigal is the internationally bestselling author of The Joy of Movement, The Upside of Stress, and The Willpower Instinct, among others. Her TED Talk "How to Make Stress Your Friend" is one of the most viewed of all time, with over 30 million views. Her popular audio program 40 Days to Positive Change shows how to harness positive emotions to fuel personal growth. She co-created the Stanford Compassion Cultivation Training, a program now taught worldwide to deepen people's experience of empathy, self-compassion, and social connection.