I have been using a HRM while keeping in shape simply to be sure I
1. Stay in a good zone, and
2. To be sure that I am challenging myself beyond that zone at times.
However, I see on the ActiveBody.org page a space for "Average Heart Rate."
Now, my HRM is pretty basic - just keeps track of current heart rate. I have another I bought for my wife which adds in lowest and highest HR.
So, what are the advantages (if any) of keeping track of the average HR, and why does it appear on the ActiveBody.org page?