4mm? How do you even measure that? 4mm is a slight difference in the tightness of your belt!Anyway, it's good that you're exercising. Now I have to get off my fat ass and do likewise.
Actually it is not that scientific. I just get a tape measure and measure from a random position. The truth is I probably haven't lost ant weight but I am not mentally prepared to face such a horrible thought. I am running well though so something must be improving. I am off to an Irish bar tomorrow night for an evening of Irish Stout and music. I am not sure of a positive correlation between stout and fitness.