Target heart rate, or also known as THR, is the heart rate valu, which determines the intensity. The THR can be used as an intensity guide for large-muscle group and continuous whole-body-activities. The target heart rate should be only used by people who wants to increase there fitness level and lose weight. Bodybuilders and people who need to gain weight shouldn’t use the THR as a guidelines for there workouts. [Read more…] about Target Heart Rate.What is THR?