What heart rate monitors tell us depends on our current fitness levels, how much warm-up and cool down time we have, and the pace and intensity of our workouts. Q: I have been athletic my whole life, and I regularly run and spend time on the cross trainer. I recently bought a heart rate monitor to make my runs less stressful. I want to get the most out of each and every run. I have always been told to play hard or go home...but now at 30 years old I want to enjoy running and exercising. I set-up the heart rate monitor with the company defaults of high (171) and low (121) heart rate scale, not knowing what mine should be,trx equipment. I used it for a 4.7 mile run, which took me 50 minutes to accomplish. I averaged a 161 heart rate with a low of 120 and a high of 180,suspension training ...