To calculate zone two heart rate, multiply your max heart rate by 0.6 and 0.7, which gives you the lower and upper bounds. Track heart rate with a wearable and perform the talk test to gauge intensity. For zone five, multiply max heart rate by 0.85, aiming to keep the heart rate above that during working sets in intervals. The work to rest ratio is crucial for the effectiveness of the 60-second and four-minute intervals, as in short rest periods, heart rate doesn't drop significantly.

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