The Nitrox Pump is made up of several ingredients that have been selected as they have been associated with increased production of nitric oxide in the muscles. Nitric oxide synthases (NOS) are enzymes that convert Arginine and citrulline to nitric oxide. Nitric oxide is a key biological messenger, playing a role in a variety of biological processes. It is known as a vasodilator which enhances blood flow in the body which could in theory increase the delivery of oxygen and nutrients to exercising muscle. This is associated with enhanced muscle pumps during exercise. A low level of nitric oxide is associated with physical fatigue.
Hardy made his first wrestling appearance after being released from WWE at an OMEGA show, on May 24. Using his old gimmick, "Willow the Wisp", Hardy challenged Krazy K for the OMEGA Cruiserweight Championship, but lost the match. Hardy performed with the Ring of Honor (ROH) promotion on one occasion. Hardy appeared at ROH's 2003 show, Death before Dishonor under his "Willow the Wisp" gimmick, wearing a mask and trench coat. Hardy was quickly unmasked and lost his jacket, wearing attire similar to that he wore in WWE. Hardy was booed and heckled before, during, and after the match by the ROH audience, who chanted "We want Matt!" and "You were fired!" during his match with Joey Matthews and Krazy K, which Hardy won. Hardy then took a whole year off of wrestling to concentrate on motocross and finish his motocross track.