Youth brings with it boundless energy and enthusiasm, and the opportunity to make mistakes. Age brings experience, scar tissue, and occasional glimpses of wisdom. During 34 years of running, I have made many mistakes and learned many lessons (some of them, unfortunately, more than once). Through hard work, determination, and a healthy dose of luck, I enjoyed a successful competitive career. Good luck was definitely involved in reaching peak fitness for both the 1984 and 1988 Olympic trials. The problem with good luck is that you cannot depend on it. If I could relive my running career, I would, hopefully, avoid making the same training mistakes all over again. If I knew then, what I know now, here are seven things I would do differently.