In Your Only Option , Dr Mark Hines details his attempt at the brutal Iditarod Trail Invitational – one of the longest, coldest, toughest and most dangerous human-powered races in the world. Few people have ever finished this incredible event on foot, making this an incredible and intimidating undertaking. For Mark, attempting it alone and on foot meant entering a world alternating in pain and peril, succeeding through harsh blizzards and facing a dangerous crossing of Norton Bay. Mark blends vivid storytelling with scientific insight and plenty of humour, exploring not only the landscape but also the limits of human endurance. This is a book for anyone who loves adventure, the outdoors, and tales of courage against the odds. Mark's account is captivating and engaging, intended to be enjoyed by all readers of adventure and endurance books. Your Only Option is the raw, uncompromising story of survival, resilience, and obsession on the Iditarod Trail.