If it’s wrong to allow two animals to tear into each other for people’s amusement, it surely is equally contemptible to expect humans to pummel each other as well. One need look no further than the sport’s greatest icon, Muhammad Ali, to see what ghastly damage years of taking blows to the head have exacted on him and his body. And most who are dedicated to the sport live lives far from the glowing spotlight that still surrounds Ali. For every champion prizefighter, there are countless others wrestling with the headaches and traumas of a career brutally played out in the cacophonous din of the ring.