Book excerpt: On a sweltering summer day in 2010, Christine Warren stepped into a 24-foot canoe and paddled toward a goal that she never previously imagined possible. The Texas Water Safari is a 260-mile paddle race from the Texas Hill Country to the Gulf Coast. Run continuously since 1963, the course follows the San Marcos and Guadalupe Rivers to the coastal fishing town of Seadrift. Paddlers must complete the race in 100 hours. While the exhausting pace and blistering heat are reason enough to bow out, it's the ancillary hurdles that often eliminate racers long before the finish line: dam portages, water moccasins, logjams, mosquitoes, dysentery, alligators, sleep deprivation, and equipment failures. Paddlefish is the first complete narrative ever published on The Texas Water Safari. With a mixture of humor, misery, history and triumph, Christine has written an engaging and entertaining memoir of her yearlong transformation from a mom, writer and fly fisher, to a viable competitor in "The World's Toughest Boat Race." If you've ever wondered what extraordinary challenges lurk beyond your comfort zone, this book may help you discover what's ultimately possible.