Most humbling yet at the same time reassuring passage:
"In part, Carpenter has owed his prowess to his physiology. His resting heart rate has been measured at 33 beats a minute, lower than those of Michael Phelps and many astronauts. In a test at the United States Olympic training center in Colorado Springs, Carpenter’s VO2 max, a gauge of the body’s ability to process oxygen, registered at 90.2, perhaps a record high for a runner. (Only Bjorn Daehlie, a Norwegian cross-country skier, has scored higher. Lance Armstrong recorded an 81.)"