Nitric oxide. The “perpetual pump.” Cell-signaling vasodilators. You’ve heard about it, now it’s time to add it to your training program. What is vasodilation? In plain English, it’s when blood vessels dilate or relax. When blood vessels relax, they widen. Nitric oxide (NO) is the key here. NO is an important endogenous pulmonary vasodilator. As a vasodilator, nitric oxide has the ability to increase your body’s ability to deliver blood to working muscles. More blood means more oxygen and nutrients that are being pumped into skeletal muscles. All this translates into bigger, fuller pumps and better overall gains. In fact, with NO, you can expect increased muscle size, strength, endurance, and quicker recovery times.