Heart rate training is one of those things that sounds technical, but it’s actually pretty simple once you strip it down. At its core, heart rate training is just a way to measure how hard your body is working in real time. Instead of guessing your effort based on how you feel, you’re using your heart rate as a guide to keep your training in the right zone for your specific goal.

Think of it as a speedometer for your effort—not telling you how fast you’re going, but how hard your engine is working to get there.

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