HIIT for 20 minutes, no more than 3 X/week at first, to see how ur body reacts is what Id tell u right off the bat, however, I dont know what/how ur diet is (if cals are VERY low, HIIT may not be a great idea), how much ur looking to loose etc...I dealt with way more LBM loss than fat loss when I did HIIT on an empty stomach...People are quite divided on this issue...Have a protein shake and a small piece of fruit or oats(even better blend em together) about 30-45 min pre cardio. just MHO



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