You should always work within the safe heart rate range for your age, to be safe.
"Fat burning" means burning fat during the session.
Depending on your workout and your diet, you can easily burn more fat during recovery if you work above the "fat burning" range.
Interval training is something to look into.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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