Gnar: adjective, short for “gnarly,” def: any environment or situation that is high in perceived risk and high in actual risk. Country: noun, def: any defined territory, landscape or terrain, fictitious or real. Recent discoveries in embodied cognition, flow science and network neuroscience have revolutionized how we think about learning. On paper, these discoveries “should” allow older athletes to progress in supposedly “impossible” activities like park skiing. To see if theory worked in practice, Steven Kotler put these ideas to the test on the ski hill, conducting his own ass-on-the-line experiment in applied neuroscience and later-in-life skill acquisition—an attempt to teach an old dog some new tricks. But this is way more than one man's monomaniacal ski quest. It's flow in real time. It's a how-to for utilizing the tools of peak performance to unlock our superpower and attack hard challenges throughout our later years. This is a book about goals and grit and progression, especially in the second half of our lives. It’s a book about what it takes to fight off that quaint human urge to die a little bit each day. It’s an antidote for the weariness. In short, this is a book about growing old and staying rad. Compelling, dramatic, filled with wisdom, science and practical advice, Kotler makes a great case for why even non-skiers will revel in this feverish exploration of how to apply the art of impossible to your own passion.  Whether it’s hurtling down a mountain side, running a local 3k race, or mastering Yin Yoga, Kotler invites us to explore our own way of peak performance aging and delightfully teaches us the language of gravity, the language of courage, and the language of possibility.