You’ve probably heard of zone two training, but what about zone zero? Heart rate zone training is becoming increasingly popular, with many people paying close attention to what the best fitness tracker on their wrist tells them or even wearing chest straps for more accurate feedback.

For everyday exercisers, though, all that data can feel confusing and unnecessary. Zone zero strips things back. It's easy to do, requires no specialist tech or complicated calculations, and still offers benefits.

Fitness trends appear online every year. Some demand all-out intensity and discipline, while others focus on making exercise more approachable. Zone zero belongs firmly in the latter group. It takes very little effort, yet comes with advantages that make it worth knowing about.

To explain what zon

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