According to my exercise physiologist, muscle does NOT weigh more than fat! For example, one pound of fat and one pound of muscle weigh??????? THE EXACT SAME...one pound. Muscle makes you smaller because as some on the boards say, fat is fluffy. Fat puffs you out, muscle makes you lean. Deanna

No, I don't think anyone gains three pounds of muscle in one week, but it would be nice.

The way I understand it (and this is according to Bob Greene ) you probably will gain weight when you start excercising. This has nothing to do with gaining muscle, but because the way your body responds when you start tearing down fibers to make muscle. In other words, when you start working out, you'll also start retaining alot of Water. You should get discouraged if you gain weight at first because it will work its self out eventually.

I was looking to see if anyone pointed out this fact yet, and you did. When you tear muscle down it creates inflammation and inflammation is edema. Edema is Fluid so there could well be a weight gain and it is from exercise.

I am guilty of claiming it is muscle too, I'm just too lazy to explain it as you did.