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When you do cardio, just remember that it takes about 20 minutes or so to get into the fat-burning state. Up to 20 minutes, your body is using the fatty acids in the blood stream, glucose, etc. If you do too much cardio in one session (i.e. more than 45 minutes), then your body starts to eat away at hard-earned lean muscle tissue along with fat deposits
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This isnt exactly true, yes after 20min or so your body will have less blood sugar to use. However, it has no difinitive effect on fat loss. If it did, all those doing HIIT would still be fat.
Also as far as burning muscle goes, there isnt much to burn for you at this point JP. You will need to worry about this later down the road when your all buffed up and jacked though.
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