This chart is a high-intensity interval training workout protocol that can be used with cardio exercises such as walking, running, rowing, cycling, swimming -- anything that can be speeded up and slowed down. On a scale of zero to 10, moderate cardio intensity (which can be sustained for a long time) is at 5 to 6. High intensity is at 7 or above, and recovery intensity is back down at 5 to 6.
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