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Anonymous
Generally, for the first half hour of cardio, the energy you burn is from your stored glycogen levels, which means that it's basically from your body's "quick supply" of calories taken in from your food.
After this barrier has been crossed, everything you burn is purely fat.
But you still burn fat before it... just slower. Plus, cardio gives your metabolism a kick which'll also burn more fat throughout the day.
But for max results, yeah, train on an empty stomach. Pre-breakfast cardio is the SHIT for leaning up.
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