The Staffelsee, which is often frozen over in winter, offered a wide range of winter sports opportunities. The lake has always been used for skiing, ice skating and sledging, but also for motorcycles and vehicles of all kinds. A special type of vehicle was the so-called Boandlrodl, also called Boa-Rodl or Boana-Rodl depending on the dialect. The Bavarian word "Boandl" refers to a bone, in this case animal bones, usually thigh bones from cattle or pigs, which were nailed to the underside of the board. The smooth, runner-like bone edges enabled extremely high speeds on the ice. The board served as a standing or sitting surface for the sledder. The use of animal bones, also for ice skating, is one of the most original types of blade production: archaeological finds prove the existence of bone sleds as early as the Bronze Age. In the 1920s, races were popular on Lake Staffelsee, especially during carnival time, in which standing tobogganers pushed off at high speed across the ice with ski poles. Photos from the time also show men standing up and "tobogganing" women sitting on the board across the lake.