The Art of RunningIn 490 BCE, the indefatigable Athenian herald Philippides made his legendary 26 mile run to deliver to the people of Athens news of their city's victory over the Persians. Each year, all over the world, thousands of athletes and millions of enthusiasts replicate Philippides's marathon. Why do we run? To what end all the effort and pain? The Greeks were the first to ask these questions and to wonder why we choose to measure ourselves against others;