[Flabbibulin]

^^^Yep, no doubt about it that gaining muscle and losing fat are mutually exclusive. The more likely scenario in a person losing weight is they are losing fat and muscle, but the loss of fat is revealing muscle they never realized they had. When I use the term "gain lean muscle mass", I am basically referring to a slow and gradual increase in size that aims to minimize fat gain as much as possible by taking it easy and slow- weight gain means muscle and fat though, Otherwise, I agree that gaining muscle and losing fat is incredibly difficult without the assistance of illegal drugs.

edit- oops, mixed up fat and muscle in that last sentence. fixed.