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That means zone 2 cardio can be running, brisk walking, cycling, swimming, rowing, skating, and elliptical training.

Heart rate method\n\n Dr. Luks says you can get a rough estimate of your own heart rate cutoff for zone 2 if you know your max heart rate (max HR). Subtracting your age (in years) from 220 gives you a ballpark estimate of your max HR. Zone 2 is around 65-75% of your max HR.