DOUBLE-THRESHOLD FOR MORTALS

Finger pricks and twice-daily workouts are impractical for the average runner. Instead, use these tips to tweak your training, build your endurance, and stay injury-free.

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Find your pace → If you want to invest in a lactate meter, go for it. But there’s a less invasive (and less expensive) way to estimate your lactate threshold using a heart rate monitor and rate of perceived exertion (or RPE, a scale on which 1 is very...

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