Understandable where you're coming from, because I used to advocate the same activity. But the amount of fat that is burned during low-intensity morning cardio is negligible. Considering that you have just awoken from an 8-hour or so overnight fast, your body's BMR has dropped accordingly. To extend the fast another hour (or however long it takes you to complete the empty-stomach cardio) will not do much in the way of counteracting the halted BMR, as it will elevate it only slightly. In other words, anyone performing exercise in the context of a suppressed metabolism will not derive the full benefit of the exercise. The famine switch has been flipped in the body; creating an additional caloric deficit through exercise will not elevate the metabolism as much as after a meal. This is why you see all these health nuts starting to urge people to never start their day without breakfast. BMR is kicked up to its normal pace and the body will be more receptive to the effects of exercise, whose efficacy is compromised by upwards of 50% in a fasted state. That and the fact that low-intensity cardio does nothing in the way of increasing resting growth hormone levels that HIIT cardio does. With strength loss as the issue with HIIT, eating more food will make up the difference, as well as scheduling of the HIIT on non-training days. Endomorphs would probably respond better to HIIT, which would likely work against ectomorphs. The implications: you will see someone reach a higher degree of leanness dropping empty-stomach low-intensity morning cardio altogether in favor of HIIT cardio, which makes for the ability to put more food down the hatch without worrying about it being partitioned towards adipocyte storage.
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