I define a good pump as "veins popping, muscles full and puffed up.."I know some guys take NOx2 before a workout because they like the look, the feel...
Did you know that viagra was being called an enhancing drug when the olympics were in session? the drug brought more blood to the muscles, therefore giving the person an advantage..a better workout. Doing your reps with the weight you want & with good form will get you results...having more blood in the muscles when you train would give you better results faster.