In his late thirties, celebrated essayist, journalist, and author Bill McKibben -- never much of an athlete -- decided the time had come for him to really test his body. Cross-country skiing his challenge of choice, he lived the fantasy of many amateur athletes and trained -- with the help of a coach/guru -- nearly full-time, putting in hours and miles typical of an Olympic hopeful. For one vigorous year, which would culminate in a series of grueling, long-distance races, McKibben experienced his body's rhythms and possibilities as never before. But the year also brought tragedy to McKibben and his family as his father developed a life-threatening illness. Forcing a deeper exploration of both body and spirit, the arrival of this illness transforms McKibben's action-packed memoir into a moving account of two men coming to terms with the limits of the flesh. The author of such impassioned and groundbreaking books as "The End of Nature" and "The Age of Missing Information," Bill McKibben is re-nowned as an original thinker. Here, writing with his trademark honesty and insight, he once again creates a provocative a