VO2 Max is a measure of how much oxygen your body uses during exercise. It increases with strenuous training and it's the best indicator of how fast a rider will be. They also found that his body produces an abnormal amount of endorphins during exercise. This enables him to endure more pain than the average person.
             Lance was twenty-one when he turned professional. In his first year as a pro he won the world championships in Spain and became the youngest world champion in history. This was an unbelievable feat considering his age. Armstrong says "cycling is a sport that embarrasses the youth", but even at his age he was having a great first season as a professional. However, Armstrong's performances in 1994-95 were less spectacular.
             In 1996 things started to come together for Lance. He says he felt like he was finally coming into his prime. Armstrong won a race called the Fleche-Wallonne, a grueling race through the Ardennes that no American had ever conquered. He also had five second place finishes and finished the spring season with a win at the Tour Du Pont, a 12-day, 1,225-mile race through the Carolina Mountains. He was about to break into the top five international rankings for the first time in his career. However, something wasn't right about his body that particular year. After his win at the Tour Du Pont he was too exhausted to pump his fist in the air as he usually did at the finish line. His eyes were blood shot and his face was flush and pale. After
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