Bodybuilding Motivation - The Rivalry <br /> <br />Rivalry. It drives each other. Pushes individuals farther than they thought possible. The amount of energy spent trying to challenge each other, top each other, defeat each other - is essential in sport and competition. <br /> <br />Phil Heath & Kai Greene are no exception to this rule. They are both true competitors in their own right - but against each other, they reach a new level of potential.