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Jake Fricker said:
I wouldn't do this with a phone. You need a Garmin with a heart rate monitor- ideally a chest strap as the wrist monitors are not overly accurate. Forerunner watches are some of the best in the Garmin range.
Thanks Jake, I was wondering if I could upload the data to more than just a tomtom app so that answers that question. A friend of mine also gave the same advice. Im particularly interested in recovery rates as a measure of fitness. Are there other tomtom friendly apps or sites that can get at that data? I haven't tried the tomtom app yet so it might well have this function.