Muscle Separation?

[tri-terror]

How does one achieve excellent muscle separation?
I know a big part of it is being lean but is that the only thing? Genetics?

 

[Shelby]

Hypertrophy helps a lot.

 

[xjpx]

I think muscle size, as shelby has stated makes the biggest diff, with a muscle like glutes u need good level of development to show detail and more separation.

 

[JonnyO]

I think Shelby and xjpx hit it, because in the past I had good separation but not much in my glutes and hams, this year after doing tons of squats and getting pretty strong at them they grew quite a bit and looked so much better and harder when i thought it was just a genetic thing before. I was wrong. I'm sure muscle maturity plays a big part in it as well.