The Crux details Oswaldo Zuniga's dive into the psychology of climbing, and methods for making major breakthroughs in the sport, including how lessons learned can translate to daily life. Readers will be quick to observe that the work is deeply personal, as it details Zuniga’s struggle with his mother’s cancer, career changes, and journey in bouldering. The Crux is thought provoking, offers insights into why climbers struggle to improve, and how climbing as a sport serves as a reminder for living a challenging, thoughtful life.