Ekiden is a type of long-distance relay race. Each team has its own sash, also known as a tasuki, which is worn by the runner and then handed off to the teammate running the next leg of the race.
The tradition of Ekiden racing began in Japan in 1917. It was inspired by the couriers of Japan’s Edo period (1603-1868), who would run to deliver messages between Tokyo and Kyoto (the old imperial capital). These messengers would stop at stations for rest and refreshments, often passing the messages to other couriers to run the next leg of the journey.
At this year's Ekiden, the whole distance of the course is 42.195km. Each team consists of four runners (minimum one female runner) running 10.55km leg each.