Boxing is a punishing sport, not just for the blows that the athletes suffer in the ring, but for the way in which it preys on young men with raw talent but few options, tempts them with fame and money and then discards them like carcasses when they cease to draw crowds — and profits. 
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That brutal industry is the focus of Champs, a new documentary by Bert Marcus, centering on three legends — Mike Tyson, Evander Holyfield and Bernard Hopkins — who got their start in the most dire of circumstances, achieved the status of legends and then crashed hard.
We've got a sneak peek at this compelling doc, which features a number of interviews from sports writers, experts and celebrities who love the sport. Check out what Mary J. Blige, 50 Cent, Ron Howard and Denzel Washington have to say about boxing in the clip below.

Champs comes to select theaters and VOD on March 13. Click here for more details on how to see the film. Watch our exclusive clip below.

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(Photos from left: Jamie McCarthy/Getty Images, Chelsea Lauren/Getty Images for Time Warner Cable, Robin Marchant/Getty Images)