“You are your own cheerleader,” she said. “You’ve survived 100% of your worst days.” I lay there, blinking. It sounded stupid enough to work. Mel Robbins has a podcast, a bestselling book (The High 5 Habit) and a global tour. Hundreds of thousands of people apparently gather to high-five themselves into transcendence. There were studies cited, testimonials, people in the comments declaring it had changed their lives.