I've been lifting consistently for over a month and have noticed that i'm gaining weight (unfortunately) but you wouldn't know by the way my clothes are fitting. I would think that the extra weight would be causing my clothes to be tighter. I've heard muscle weights more than fat but the doesn't seem logical...a pound of muscle and a pound of fat still weigh a pound. It seems a contradiction to gain weight and clothes to fit better, what is the reason behind this?
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You're right that a pound of fat and a pound of muscle both weigh a pound, but a pound of muscle takes up less space than a pound of fat. So, if you have the same volume of muscle and fat, the muscle will weigh more. If you're working out a lot, you may be toning up and getting smaller but still gaining weight - this is because you're converting fat to muscle, which takes up less space. This article puts it pretty clearly: "muscle weighs more by volume than fat."
It is important to note that in and of itself lifting weights will not cause you to gain weight. You gain weight by eating more than you need.
Exercise will change your body composition (fat->muscle).
It sounds like you have both going on.
First converting fat into muscle is a myth, it's physiologically impossible. Fat is made out of Adipocyte while muscle is made out of mostly proteins.
You can improve your body composition by increasing your muscle mass while decreasing your body fat but the two are happening independent of each other.
Another myth is toning. Again very similar to muscle -> fat. It's possible to achieve a 'toned' look but I prefer not to use that terms since its misleading.
As for the reason why you are gaining weight from strength training. It comes down to several factors:
So there you have it, those are all the factors which impact your weight in relation to training.