Today is the Boston Marathon, the oldest annual 26-miler; the "granddaddy" of road races. In just a few hours, hundreds of bodies will whiz through the city, pounding the pavement right outside my window. Without feeling side cramps, pulled hamstrings, or the throbbing of achy joints, the marathon is, from a spectator's vantage point (and perhaps from an ecstatically adrenaline-jacked runner's standpoint, too), a rather exhilarating, life-affirming, freeing experience. And yet, the opportunity to feel such freedom and exhilaration wasn't always afforded to everyone.