How do you get the line inbetween your abs like this? (PICS)

How do you get the line inbetween your abs like this? (PICS)

haha kk gave me some motivation to improve my abs but my muscles are too smalll so I am currently going to bulk save the cutting for the summer

 

How do you get the line inbetween your abs like this? (PICS)

Pretty sure it's different for everyone. My upper 4 ab muscles are recognizable as 4 muscles, but when I feel them, I can tell that they are split vertically, but only like halfway split horizontally. If that makes any sense.

 

How do you get the line inbetween your abs like this? (PICS)

repped