What does it mean to be in Zone 5?

Zone 5 – sprint: A heart rate at 90-100% of your maximum heart rate is usually only attained by professional athletes or those who require bursts of speed, such as 100- to 400-meter runners, who will need to train in heart rate zone 5 in order to improve.



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Zone 4 is for anaerobic capacity, the limit of energy your body can produce using anaerobic means, and should be about 80-90% of your HRmax. Zone 5 is the target zone for short burst speed training and should be about 90-100% of your HRmax.

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It extends across the northern part of the Central US (including Minnesota, Iowa, Nebraska, and Wisconsin). It reaches all the way to the Northwest (including Montana, Wyoming, Northern California, Oregon, Washington, and Idaho). Parts of Colorado, Nevada, and Alaska also fall under Zone 5.

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