As a 30-time marathon runner, I can confidently say that one of the most important ways to perform your best — whether it’s in the marathon or your career — is to have a personally meaningful “Why”. — Pheidippides had a great reason to run. Over 2,500 years ago, King Darius of Persia and his mighty army approached the shores of Marathon, Greece. The Persian empire had been rapidly spreading across the Mediterranean for decades and overtaking Greece was next on the king’s list. …