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What are cardio heart rate zones?

Cardio heart rate zones are a feature of many exercise programs, but what are they and how can they help you get fitter? We’ve got the answers. 

Whether you’re going for a steady run or increasing your stroke rate on a rowing machine at home, exercise that gets your heart pumping improves cardiorespiratory  fitness, builds stamina and burns calories, according to the American College of Sports Medicine. But how do you know if you’re exerting the right amount of effort during a workout? And when using heart rate as a training tool, what’s the sweet spot to get the maximum benefits?