If you eat 500 calories LESS each day, you will lose one pound of body weight in a week. If you eat 500 calories MORE each day, you will gain one pound of body weight in a week. But these things are true ONLY if you do not increase or decrease your level of normal activity
Activity (exercise) such as weight training/bodybuilding burns between 200 and 450 calories per hour depending on your weight and intensity.
Most of us would like to be leaner and become stronger or just plain want to have bigger muscles all round. I got back into weight train after a lot of years off with one purpose to negate the effects of getting older.
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