Peak performance expert Steven Kotler decodes the system used by elite performers-from extreme athletes to world-class CEOs-to achieve goals that seem completely out of reach. Grounded in neuroscience and twenty years of research, the book argues that "impossible" is just a mental barrier that can be dismantled using a specific four-part formula: motivation, learning, creativity, and flow. Kotler provides a practical, science-backed playbook for "stacking" these internal drivers to achieve peak performance, showing that extraordinary success isn't about luck or genius, but about getting your biology to work for you. It's an essential guide for anyone looking to push past their personal limits and master the habit of ferocity.