You want an awe-inspiring network of veins coursing over your body, like roads on a map? You want "pipelines" in your arms? You ready to train hard to get it? Yeah, training is important. But more than anything else, vascularity is a function of your diet--that is, it depends largely on your bodyfat levels and water retention. If you got too much of either, you won't see the pipelines.
For more, check this thread out: http://forum.animalpak.com/showthrea...ht=vascularity