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This is really annoying - syncing changes my HR Zones from HRR to HRmax

On my last runs, my pulse zones were wrong. Watch showed I was training in zone 3 while I was definitely training in zone 2. So somehow the zones got changed and I didn't change them. After having experienced this a couple of times, I found out what caused it: Syncing the watch using a cable to my pc. It's quite annoying, but at least I now know to change my zones back each time I've had the watch connected to the pc.