when I use a treadmill and enter weight and everything and target heartrate (the machines that take heartrate) it shows that a certain heartrate range is the “cardio zone” and anotehr is the “fat burning” and another is one about stamina.
What is the difference and why is one called fat burning? Is that the optimal heartrate for fat burning? is the one above it also fat burning? Because I know that all exercise uses energy and all energy is the basis of eating and exercising.

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