Běh na Čerťák is a running event based in Rymařov, with the race hub in the Flemmichovy zahrady area on Sokolovská street, often called Flemda. Children run first in the late morning, and the main field starts after those races finish, usually around 11:30. The event is organized by AK Běžci z Rymařova and is part of the Great Prize of the Endurance Runners of the Olomouc Region.
The program starts with short races for children: about 200 m for preschoolers, 500 m for younger pupils, and 1,000 m for older pupils. The adult race is 12.6 km, with men's categories running up to 70+ and women's categories up to 50+. Children under 14 enter free, adults pay less when they register online, and the race also serves as the Ing. Ivan Sovír Memorial.