Ab Exercises while bulking?
I'm just finishing p90x and from following the program, I have got a 6 pack. I'm 5'11 160, and I want to bulk up now. I was wondering what the best exercises are for your abs to increase abdominal muscle mass? I'm assuming weighted exercises of some sort, is there any way to do a 4 month bulking phase (trying to gain a solid 20 pounds) without losing the 6 pack (like keep up with fat gains by increasing abdominal mass)? Would doing the abripperx cd from p90x while bulking aid at all in this process?