Mark Synnott is a world class big wall climber whose writing has appeared in Outside, Men’s Journal and National Geographic. Mark’s new book “The Impossible Climb: Alex Honnold, El Capitan, and the climbing life,” covers his dangerously precocious introduction to climbing and the journey that led him to climb alongside Alex Honnold and document his amazing free solo of El Capitan. The book is available beginning today, wherever you buy your books.