Maybe something you learned the hard way, or something you found out right before making a huge mistake.

E.g., for audiophiles: don't buy subwoofers from speaker companies, and don't buy speakers from subwoofer companies.

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I have read sources in the past that suggest endurance exercise can slow the decline in max HR. If I find them again I will share here.

In my own experience, I have not lost a single bpm in a decade of tracking.

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