John Colver is an award-winning athletic coach, a mountain guide, and former competitive cyclist. A recipient of Seattle Magazine's Best Outdoor Fitness Program, and a King-5 TV Best of Washington Personal Trainer Top 5 Award, he founded AdventX, an outdoor fitness training company, in 2003. Since that time he has personally trained more than 600 clients using the principles in The Nature of Fitness. Among his students are athletes who run anywhere from 5-kilometer to 100-mile races, compete in cycling and triathlon events, and summit major peaks, including Mount Everest.M. Nicole Nazzaro is a widely published sports and fitness writer who has written for Sports Illustrated, American Track and Field magazine, the San Francisco Chronicle, amongst others. A graduate of Harvard College and UC Berkeley, she is an avid runner and a successful member of John Colver's AdventX program in Seattle, where she has trained for a summit climb of Mount Rainier and her first marathon.