From 16 to 61 Miles a Week

Supposedly, you're supposed to increase your mileage no more than 10 percent each week. Or, something like that. Baby steps; work, but give your body time to rest so you can get stronger and faster. However, if you already have a hovering fitness level and have been sandbagging for months, you can sort of take your chances cranking up the pace. The bottom line is, listen to your body, and learn to do what works for you. Not overtraining is something that has to be learned, but that doesn't mean it has to be difficult.