Cross country running is a sport that involves running on off-road terrain, such as fields, forests, and hills. This challenging sport is sometimes referred to using different terms, including trail running, wilderness running, or hill running. Other synonymous phrases for cross country running include off-road running, fell running, and mountain running. These terms describe the demanding nature of running beyond the confines of a track. Endurance running, long-distance running, and endurance racing are also sometimes used interchangeably with cross country running. Regardless of the term used, cross country running is a great way to challenge oneself physically and mentally while enjoying the beauty of nature.