"As a top athlete," says today's guest, Mark Tuitert, "you can easily be blinded by the goal: winning." Mark would know. He won the gold medal in speed skating in the 1500-meter event at the 2010 Vancouver Winter Olympics. When he woke up the next day, however, a worrying thought shot through his head: Now what? What do I focus on now? To answer those questions, he turned to the ancient philosophy of Stoicism.