What is it like to be running on a snowy, remote jeep trail in December, getting caught in a whiteout, and spending eighteen hours shivering in a snow hole? Is it a good idea to promise a friend you'll buy a mountain bike and ride with him 2500 miles along the Continental Divide, or help another friend, who has Parkinson's disease, race 100 miles on mountain trails? If you like armchair adventures, come along and experience running across the Grand Canyon and back, at high altitude in Colorado after recovering from cancer, 500 miles across Washington state, and the largest ultramarathon in the world, in South Africa. Spend vicarious time bicycling in Alaska, pedaling with 10,000 other people across Iowa, and racing against The Trailer Trash Girls. The author's journey from age 35 to age 71, lessons learned and perspective on what it means, are vividly described in Miles to Go: A Lifetime of Running and Bicycling Adventures.