Sentence:  There, overcome by the view and a sense of pure delight, one loses the last vestige of human reason, binds planks to one's feet and rushes downward, over wind-crust and powdered snow, over icy ridges and drifted fences, with jumps, turns, traverses, <WSD>langlaufs</WSD> and schuss-runs into the valley. 
Meaning of the word marked with <WSD> tags:  A langlauf run; a trip cross-country skiing.