all over.my friends tease me and say i look like an antomy chart.i have them in my abs, chect, arms legs, everywhere.just a matter of being lean.veins can become predominant when you blood pressure rises though.if you bp is in check i think you are fine.vascularity is just part of what comes along w/ leaning out.i hate my veins but hey they are fun to look at somtimes,haha