 He subsequently designed other tracks, including the Utah Olympic Park Track, and acted as a consultant for the Alpensia Sliding Centre.In December 1993, Lenz lost his left leg below the knee when he did not get out of the way of an American luger while clearing off the ice at the bobsleigh, luge, and skeleton track in Winterberg, Germany.Lenz returned to coach the German team at the 1994 Winter Olympics in Lillehammer two months later.