Fitness Trackers: Good at Measuring Heart Rate, Not So Good At Measuring Calories I KNEW IT ! which is why i used to do the math for each client. Suffice to say that the industry bases data on a 160 lb college age male at 7% body fat. The NPR podcast shows how skewed it is for large or thick people asians or black people or diabetics (and other people affected by disease that limits effort) http://www.npr.org/sections/health-shots/2017/05/24/529839681/fitness-trackers-good-at-measuring-heart-rate-not-so-good-at-measuring-calories But you still want a monitor, maybe an Apple watch or something? The newest Fitbit : the Surge and it has GPS http://www.pcadvisor.co.uk/feature/gadget/best-fitbit-for-2017-3501231/ How serious are you anyway ? Lets get something almost waterproof/sweat proof ... . the following is an excerpt from Consumer reports : " The $500 Whoop Strap does not track speed and laps, b...