The best time is going to be early in your day. That way you maximally reap the benefits of the "afterburn" effect. Basically, when you perform vigorous activity, your metabolism stays elevated for hours after the session is done with.
I don't condone fasted cardio unless you have already unsuccessfully tried to reach a certain level of body fat with a solid diet and performed your cardio in a nourished state.
If you do have to resort to fasted cardio, then make sure you are performing low intensity aerobic activity, and ingest a small protein only snack before going jogging to help prevent muscle breakdown. Also, try to keep the session to no longer than 30-45 minutes.



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