Since there is no one-size-fits-all approach to exercise, it helps to have a personalized rating system that allows you to keep track of your own workout. After all, a casual jog for one person might ...

RPE, a.k.a. your Rate of Perceived Exertion, may not be a metric you've used to track your workouts thus far, but experts say it may well be more useful than using a fitness watch. In short, the RPE ...