Two words no one likes to hear regardless of the venue: sustain and pain. Despite the look on your face right now, this is the best definition of an aerobic capacity effort, also referred to as riding at VO2 max. This level of intensity is not for the faint of heart…er…I mean it is not for everyone. Actually both. I just finished watching stage 18 of the Tour de France, which consistently provides a spectacular display of aerobic capacity entertainment. How do they do ride for prolonged times at that intensity? Genetic freakery aside, there are numerous training elements that combine to produce this extreme level of performance.