Bro clen's not just going to create a six pack for ya. And - if your looking for bf loss but no weight loss then mathmatically your looking for lbm gain. Clen clearly won't do that (in of itself). It will help with bf loss if the diet is there, thats pretty much it. To get a defined midsection, or six pack as you say (if you have the genetic ab structure), you'll need to get under 8% bf, and maybe closer to 6%. Proper diet & training will do most of that, clen is merely an assistance.