The number of people taking up the sport of running has increased significantly over the last 10 years. Sports experts give many reasons for the rise in the popularity of running. Because many people want to save money, they are avoiding paying fitness center dues and choosing instead to pound the pavement in running shoes and clothing, which are relatively inexpensive. Creative racing opportunities are also a draw for new runners. For example, adventure runs offer participants a chance to run through mud or outdistance zombies. Basically, running offers a new way to have fun while sweating.