Hi, I have dug out my very old (and virtually unused) HRM , a Polar M52. On the info i put in it M 42 6' 97kilos avg fitness it came up with a low intensity zone of 116 - 140 for me. So i rode home from work staying in that zone. 23 miles it took about 2.00 hrs (it was into a head wind and i had to go slower to stay in the zone) hrs. The HRM say that; i was in zone for 1.29 avg hr 127 1476 k/cals (seem a LOT?) 45% Fat (i have no idea what this means) My question is does this ound about right? Anything leaping out as being incorrect. I am asking as i beleive the HRM could be a really useful tool for me if only i can work out how to use it and the data properly. It does seem very complicated!!! Thanks in advance andy.