Nobody can tell you how to set a personal best. But here's how NOT to: run with the idea of setting one. You cannot order up a personal best as if it were a turkey on rye. It's not a conscious act. A personal best is a kind of gift bestowed upon you. You're not sure where it came from or how. It's very hard to achieve a personal best after you've run for a while and brought your times down. It takes training and hard work. But remarkably, those who achieve personal bests all say the same thing: how easy it felt. They weren't straining, they weren't pushing; it just seemed to come to them. If you run with the idea that you're just going to enjoy yourself, that you're going to relax and have a good time, that whatever happens, happens - well, those are the days when personal bests occur.