There are lots of ideas out there about HR and weight loss, but how true are they and what does it mean? Well first lets understand HR max, there are many esitmations of HR max 220-age is a popular one though the accuracy of it is a bit suspect. There is also 206.9 - (.67*age), which seems to be more accurate or atleast closer to a good estimation. Max HR as a individual as finger prints the only way to truely know what yours is, would be to perform a max test, which I DO NOT RECOMMEND OR WANT ANYONE TO TRY!!! This means we are left with estimations.