I just bought a Freestyle heart rate monitor to use with my running and workout the other day. I used it for the first time today when I ran the 4.5 mile lakes around LSU's campus. I set the watch for the lowest heart rate target zone 50-70% of my max heart rate....which would be between 97 and 137 beats per minute. I am used to running the lakes at a pretty fast pace and I was amazed at how slow I had to go to stay in that target heart rate..I did alot of walking at it took me almost an hour to run something that I can usually run in about 30 minutes. what I really wanted to know is...what are the benifits is running in each of the 3 major heart rate zones...50-70%(healthy heart zone), 70-80%(fitness zone), and 80-100%(performance zone). It also says that the healthy heart zone is the "fat burning zone". so does that mean that I am still burning more fat by running in the lower zone than by running in a higher zone? Thanx