Does your tracker or sports watch have a heart-rate function? Or have you used cardio equipment with built-in HR measurement? If so, you may be aware of the so-called “Fat Burn” heart-rate zone.
I advise you to “mostly beware” of falling for the allure of this name, man. It sounds too good to be true. “Burn more fat with lower exertion than you would with higher exertion!” And it is too good to be true. However, low-intensity workouts in HR ranges labeled “Fat Burn” do have occasional purposes. Hence my “mostly beware” admonition.
Let’s walk through the facts and logic here, and you can make your own call.