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Heart rate tracking on earbuds was probably a mistake

After testing Sennheiser Momentum Sport and Anker Soundcore Liberty 4 earbuds with heart rate, I came away frustrated.

I decided to test multiple wireless earbuds with heart rate, but the more I looked, the more I found one-off, discontinued products like Bose SoundSport Pulse and Jabra Elite Sport. I switched to the Sennheiser Momentum Sport since it exports to the Polar Flow app; this meant I could actually compare heart rate charts directly and better test earbud HR accuracy. I used Sennheiser's fit test to confirm I had the correct ear cup size, put on my COROS strap and Garmin watch, and did one more run split into two activities: one at a slow pace, one a hard track workout.

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