MentalToughnessTraining_FINAL By Liz HichensPublished Jun 22, 2011 comments Tweet Share << Back to StoryOpen full size in new window.There’s a subtle reason why the best pros and age groupers manage to stay on top: the mind. Illustration by N.C. Winters. Liz HichensLiz Hichens is the Web Producer of Triathlete.com. She is an Ironman and marathon finisher and fan of all endurance sports.Follow @lizhichensAll articles by Liz