At the 2008 FIL World Luge Championship in Oberhof, Germany, in the men's doubles, Arlt won a silver medal. At the 2010 FIL European Luge Championships in Sigulda, Latvia, Arlt won a silver in the men's doubles and a bronze in the mixed team disciplines; and at the 2013 FIL World Luge Championships, he won a gold medal. In the last four years, Arlt and Wendl have finished in first place in the overall World Cup standings three times.