Brad Stulberg's book, "Master of Change: How to Excel When Everything is Changing – Including You," which explores the concept of allostasis, a new model of change that emphasizes adapting to uncertainty rather than resisting it. The book argues that the traditional model of homeostasis – aiming for stability and resisting change – is outdated and detrimental to both personal and societal progress. Stulberg uses examples from various fields, including climbing, sports, science, and societal movements, to demonstrate how embracing rugged flexibility, a combination of adaptability and steadfastness in the face of change, leads to greater success and resilience. Through anecdotes and scientific research, he reveals how to develop a fluid sense of self, manage expectations, and respond thoughtfully to challenging situations. The book encourages readers to cultivate wise hope, meaning, and purpose in their lives, despite the inevitable presence of suffering and uncertainty.