Im 38 and have never really had a great metabolism so I feel I have to work harder then most to stay lean. I usually do 4-5 50 min sessions a week, so to each their own. Again if your running over 130 bpm, once the glycogen is burned from your muscle your body will break down muscle instead of fat as a fuel source and this is especially true on low carb diets. If you just want to burn fat -you can go longer and not interfere with muscle breakdown by low level intensity cardio. Its true HIT cardio burns more cals but the make up of the cals is all wrong.Originally Posted by Raw Deal
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