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Can tracking heart rate variability make you fitter?

The debate continues over whether using HRV data to plan your training schedule is effective.

Some experts say that you can give yourself an athletic edge by tracking and responding to changes in your HRV - especially now that wearable devices have started measuring it.

THE human heart beats like a metronome, right? All evenly spaced thumps and regular rhythms? Wrong.

When you're at your healthiest, your heart is actually more like your six-Scotches-deep uncle whaling on the family drum set: The... beats... are spaced... unevenly.

It's only when...

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