Generally, the harder you work the higher your heart rate and the more calories you burn. So zone 2 will not burn calories faster.
The zone advice is more about pacing yourself. For a given calorie burn, you may find zone 2 significantly more *pleasant* than burning the same number of calories at a higher heart rate. It will take more time, but you’re also in a better position to use that time thinking, chatting, or being entertained rather than just focusing on how exhausted and winded you are.
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