Frustrated

Will someone please tell me the fastest way to burn fat? Everything else has cooperated except for this mummy tummy of mine. It has been the hardest to get rid of and to maintain in shape. I guess I will have to accept the fact that once you have had kids, things are certainly not the same anymore and you need to work doubly hard to get things back in shape. Tough luck, eh? But that is the sad truth, and we got to live with that.