Hello I'm a runner and can run up to 20 miles no problem.
But this thing about calories well is just not right on me.
Im lucky if I burn 78 calouries a mile. That's running on average 9-10 minute miles. Im also lucky if i can get my heart rate over 158.
I have the Garmin 405cx so it's not an old out of date thingy that I picked up.
Does anyone have any reasons why this happens.
Many thanks any help would be much appreciated.