Rate of Perceived Exertion (RPE) is a powerful tool for personalizing your workouts, especially in strength training. By using RPE or its counterpart, Reps in Reserve (RIR), you can match your training intensity to your current fitness level and goals, ensuring optimal progress without overloading your body. RPE is a subjective measure ranging from 1 to 10, reflecting how challenging a set feels. For instance, an RPE of 10 means maximal effort, while an RPE of 7 indicates you could perform 3 mor