I am writing this from my personal experience over the past 2 months or so. The easiest way to gain weight is to go to gym for a few days and then stop going for a week or so. Go again for a few days and then stop going for a week. I don;t know why this happens, I just start eating like crazy after I go to the gym and the effect remains for a few days even after I have stopped working out. The weight gain is at all the wrong places and of the wrong sort so beware. He He.