Birkebeinerrennet is a popular cross-country ski race held annually in Norway. The event covers a distance of 54 kilometers, starting from Rena and finishing in Lillehammer. It attracts thousands of participants, ranging from elite athletes to recreational skiers, and is part of the larger Birkebeiner festival. The race commemorates the historical journey of the Birkebeiners, a group of warriors who transported a young prince during a civil war in the 13th century. Skiers must carry a backpack weighing at least 3.5 kilograms, symbolizing the weight of the prince, adding a unique challenge to the event.