Stupid Question

[tinyGuy]

You can put on size, only if you put on weight? I mean let's say if someone has 16 inches arms and wants to add some size, he needs to put on weight...besides f-ing training ...

So.. can you put on muscle size without put on weight?

I know...it may sound stupid...but these things are confusing for me...

[Damienm05]

Lean muscle has a lot of weight. Provided you increase your lean body mass and your body fat remains the same, you'll notice an increase on the scale, always.