Lean Muscle gain
 

I am trying to gain some lean muscle. What would be a good diet to do this? And what kind of exercises should I be doing? I am 40 years old and am in good shape. I just want to be able to gain some lean muscle. I have been weight lifting for a while now but am not really seeing a huge difference.

Give us a better idea of what you have been doing as far as training nad diet.