I have had great success doing a variety of different types of cardio. My rule of thumb is fasted cardio should be low intensity, otherwise I use interval training which really kicks in with the fat burn. What I have really had success with just lately is muscle preservation/gain while burning fat. Yes the supps I have been using have played there part. I just can't believe that at close to 50 I am still able to add mass so easily. I really caught my off guard, I expected to lose weight but I didn't I just burned fat.