Last season, Aino-Kaisa Saarinen was down and out. Little by little she has built back her fitness and self-confidence, with a secret ingredient: fun. After winning silver in the Olympic 4 x 5 k relay with her teammates from Finland, Saarinen thanked the U.S. women for inviting her to train with them in 2012 and said she had learned that you can't be so serious all the time.