Have you heard of zone zero? The term crossed my desk for the first time last week when I read an article by Tom Brownlee , an associate professor of sports science at the University of Birmingham, about effortless exercise. Effortless exercise?! Surely that’s too good to be true.

So I contacted Brownlee to tell me more about zone zero.

What is zone zero?

Fitness trackers and smartwatches with heart rate monitors use heart rate zones numbered from one to five to show how hard your heart is working during exercise. You may like

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