ABSTRACT
Extreme endurance activities have grown in popularity across the world. While no consistent definition exists for what constitutes an extreme event, the majority of such designations occur when an event is of particular length or requires a substantial duration of time to complete. Cycling events can span a wide variety of single-day distances ranging from 25 to 100 miles each day. At the professional level, cyclists can spend well over all 100 days racing per year, oftentimes in multi-day, staged racing events. While several multi-modal events exist combining a variety of activities, triathlons are easily the most popular of these events. Triathlons combine swimming, cycling, and running. While other extreme events challenge participants through the completion of often long-duration activities within a marked course under a wide range of grueling terrain and environmental conditions, adventure racing events are often much longer than other single-mode activities and require that more than one form of activity is completed.
