The heart rate monitor is weird. On a bicycle, scooters refuse to adequately measure the pulse. The pulse stops at around 70 to 110. Yes, this sometimes happens when running. Previous Suunto measured much more logically, although also not without jambs. The watch also takes a very long time to respond to changes in the pace of running. You run uphill, show the pace, let's say 7 min / km, ran out to a flat one, and the pace is kept at 7 for another half a minute. Again, Suunto reacted to this change in a couple of seconds. Either the clock is faulty in general, or it is so with this model. Sold Suunto due to glitches in interval training (did not measure the interval), this is fine here, but here are other problems
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