German ski racer Andreas Sander, who won downhill silver at the 2021 world championships, said on Wednesday that he has been diagnosed with a mitochondrial dysfunction that is sidelining him indefinitely. Sander, 35, ruled out a start at the first downhill of the season in December in Beaver Creek. He said at a team event in Nuremberg it was totally unclear when or whether at all he would compete again. Mitochondria are organelles that are part of human cells and generate energy for them. Sander said he hasn’t been able to train over the past months and that doctors believe the dysfunction cou…