Using a GPS watch & Heart Rate Monitor are key to my training. Read the detailed article I wrote last year about how to incorporate a GPS watch and heart rate monitor into your marathon training. I have used the Garmin Forerunner 110 & Polar M400 series GPS watches for the last 8 years. Both of these brands work great, but I prefer Polar. You can read my detailed article and review of Polar watches vs. Garmin. For your convenience I’ve set up an Amazon store below to offer a variety of GPS watches.
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