What might be an ordinary playground activity in many parts of the world is serious business in North Korea.

The see-saw competition that was held at the Moran Hill Park in Pyongyang last Saturday is part of the 13th People's Games being held in the Hermit Kingdom.

The rules of the see-saw event require competitors to jump more than 2m high in quick succession for two minutes. After each jump, the contestant has to land inside a small black square at the end of the see-saw.

The national sports event, which opened last Thursday, will run until the end of the month, according to a report by Yonhap News Agency.

Other sports events featured include a number of traditional Korean games such as competing on swings that date back to the Joseon dynasty, reported AFP. The kingdom held power over large parts of the Korean peninsula from the late 14th century to the 19th century.