This document provides an introduction to triathlon and training for triathlon races. It discusses the history of triathlon and the different race distances. The main race distances are sprint, Olympic, half Ironman, and full Ironman. It provides an overview of how to begin training for each distance, including the time commitment required. The document recommends joining a local triathlon club to take advantage of group training opportunities and coaches. It also provides tips for getting started in triathlon training and preparing for races.