Originally Posted by
chinarider
It may be true the the average MHR = 220-age (which is the formula most tables & charts {or some varient of it} are based on).
I've also heard that for fit people over 40 or so, a more accurate formula is 205 minus half your age. At age 60, the (220 - age) formula would put me at a max of 160, but I can easily exceed that when running hard. The newer formula would estimate my MHR as 175, which seems closer to my experience.