I tend to use a forearm HR monitor strap, https://www.wahoofitness.com/devices/heart-rate-monitors/tickr-fit-optical-heart-rate-monitor and connect that to my Garmin GPS watch as I find it to be much more comfortable than a chest strap. I wholeheartedly agree that the wrist watch HRM are not accurate, but I have found this to be accurate relative to similar runs with a chest strap and this forearm HRM strap. I assume that whatever HRM system we use for the test, we will be using throughout our workouts for the next 3 months, true? That being said, I will use a chest strap if you feel that is much more accurate, but if you feel the above HRM strap is equal, I would prefer to wear it, thoughts? sorry, not trying to cause trouble before I even do my first workout.