teigyr, my HRM is the Polar RS200 - one that is ideal for running, evidently.

My commute is pretty short - just 7 miles of a long down hill then a short uphill on the way there, and rolling hills on my return. On the way home today my HR rarely got above 127.

Wearing the HRM sure is an education. Even wearing it first around the house was fascinating-I'd never thought how much my HR would change from sitting to standing, much less from an easy cruise rate to racing to make it through a traffic light.