Also, "intense exercise" can cause you to gain muscle mass, which is denser than fat. So, if you have never worked out before and try to loose weight by working

Also, "intense exercise" can cause you to gain muscle mass, which is denser than fat. So, if you have never worked out before and try to loose weight by working out a lot, you can actually gain more weight from muscle mass than what you loose from fat (and, so, your scale will move up even if you are loosing fat).