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by 0_____0 495 days ago
If you just need heart rate, you can pull data off a plain sensor to your phone or to a computer, they report over BLE.
1 comments

What sensor would you recommend? I have tried Apple Watch and i really only care about the heart rate. But it doesn't poll the heart rate constantly unless in exercise mode. I wish I could just constantly track the heart rate every second.
I use the basic garmin chest strap. It transmits continuously and supports things like HRV, which I suspect is a secondary high data rate mode.