Trail running is a great way to stay healthy and bond with new people. It is also a good way to get some fresh air and enjoy nature. There are many different types of trail running, from mountain running to trail running in the city. There are many places to find trails to run in your area, including parks, forests, and beaches. If you are new to trail running, it is best to start out with shorter distances and gradually build up your endurance. Find the best trail running spots in Seoul.