Drsný běh okolo hradu Potštejn is a forest-path running race held in Potštejn, Rychnov nad Kněžnou district, Czechia, with its race center at Pivovar Clock Potštejn. The primary option is 7.8 km with 350 m of elevation gain, and the shorter Malý Hrad course covers 3.9 km with 120 m of climbing. A 1 km race is available for parents with children up to age 10; children may run this distance alone or accompanied by a parent.
The start line is located in Lipová alej, approximately 200 m from the Clock brewery, closely linking the event to the village and brewery grounds. The longer course is designed for experienced runners and uses age categories, whereas the shorter course is suitable for hobby runners and children, featuring separate men's and women's categories. The race is part of the Clock Cup series, offering prize money up to 10,000 CZK for the winner. The finish area provides brewery refreshments along with water, juice, and fruit supplied by the organizers.