One pound of fat is equal to one pound of muscle. The difference is the composition. Fat is lumpy and is just, well, fat. Whereas muscle is very dense. For example, you have 2 men weighing 200 lbs. and 6 ft. tall. Man "A" watches 40 hours of TV and eats pizza all the time. Man "B" does strength training 4-5 days a week and eats healthy carbs. The difference is Man "B" has leaner, denser mass compared to Man "A" who has bulky, lumpy mass. Back in the days when I was in shape, I never let the scale define me. I was a Div.I collegiate athlete and according to the charts, I was always obese. Now that I really am, I still do not look like it (thank God for my days of being an athlete) but I know my actual body fat percentage is much higher in comparison to my lean muscle mass. Ask your trainer if he/she knows of a place where you can get your body composition analyzed. Once you know how much fat you have actually lost, i am sure you won't be too bothered by the number on the scale! Keep up the good work,