Fasted morning cardio (not intense) will ramp up your metabolism all day. I do at least 40 min 3-4 days a week. I also have a pretty physical job with rest periods. I just view it as extra cardio through out the day...
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It's not roid rage, I just don't like you...
Irrelevant. It's a myth that you burn fat when doing cardio on an empty stomach. You still have glucose in your system unless you haven't eaten for days -- in which case you'd be burning more muscle tissue than fat.