Not many remember what they were doing or where they wanted to go at 18. Luke Wiest was, for the most part, a normal student going to classes and doing homework. But between staying out late with friends and cramming for tests, Wiest spent hours training for an IRONMAN.   Wiest, a senior at East Tennessee State University, moved to Johnson City, Tennessee six years ago from Germany when his father retired from the Army. Growing up, he had an interest in sports – soccer, football and even...