I find it significant that YuNa had such a bad back injury that she could barely skate in about 2007, yet several years later at the Olympics she was invincible. Now, several years after her decisive win at 2010, she has been able to return to skating virtually at the same level where she left. Clearly some change in her training program was instituted, and her back injury did not become chronic. Her trainer at that time was Orser. Whatever happened to split YuNa and Orser, he seems to have done her a huge amount of good. I hope that Yuzuru and Javier benefit from his coaching as well.