In 2015, there were over 17 million running race finishers. Were you one of them? This is by far the largest athletic category as there are more than 30,000 races in the USA every year with the majority of them being the 5k distance. People of all genders, age brackets, and skill level are able to compete in a variety of different running events. Some of these events include Tough Mudders, Color Runs, Charity runs, obstacle races, trail runs, team races, and of course, individual distances such as the 5k, 10k, half marathon and marathon.