Endurance athletes work at creating habits and lifestyles which correspond to Aristotle’s notion of eudomania. They spend time and energy dedicating themselves to their craft. They relinquish other interests in pursuit of excellence. They fully accept William James’ notion of precipitousness as they create goals and work toward achievement. In this paper, we examine normative issues related to endurance sport participation, the potential dark side of this pursuit of excellence. Our overriding concern is how best to work toward and experience (...) human flourishing while simultaneously remaining attentive to relationships and responsibilities. In terms of potential perils associated with endurance sport, we address questions of autonomy, authenticity and identification. We contend that endurance athletes concerned with these questions benefit from transcendental and pragmatic notions of the good life. (shrink)