Ratings of Perceived Exertion, or RPE, are the subjective measures of exercise intensity perceived by the exerciser. Measurements are based on a twenty-point scale, "6" is no exertion and "20" is maximal exertion. These numbers were chosen because when multiplied by "10," they are roughly equal to the resting and max HR values of 60 and 200 beats/min., respectively. Once accustomed to a particular exercise, you will be able to estimate your exercising heart rate based on your RPE. Most people should workout at a perceived exertion between 12 and 15 (moderate to hard). See Table 5-1.
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