So what are your thought on this theory? .. That an intense weight lifting w/o uses up your stored glycogen, so that a low intensity cardio sesh leaves your body with no choice but to burn fat only for the energy it needs. Not trying to make this into rocket science, but I've read this and used it i...

I think you'd be better off doing the weight training before your cardio. You won't be as tired and will likely be able to lift heavier..

And pace yourself, it's a long journey

Never heard anything about 'breathing techniques' so no comment on that. But I'd like to add that - yes, your heart rate will come down as your level of fitness improves. Figure your body needs so much blood pumping through it at a given time .. a 'weak' heart will need more beats to get this done, ...