After a long spring of indecision, Anna Carin Zidek of Sweden finally announced her retirement from biathlon last week. “I no longer have any desire, my motivation has disappeared, and so I will stop,” the 2006 Olympic gold medalist told an Ostersund newspaper. The announcement came after months of deliberation. “Oh yes, there are many who wonder if I should continue or not next season,” Zidek had written on her blog in late April. “And...