Somehow we have been conditioned to believe that people in wheelchairs are more sedentary than the rest of us, and should be treated gently. That perception gets clobbered in "Murderball," the new documentary by Henry-Alex Rubin and Dana Adam Shapiro. In this case, the wheelchair-bound quadriplegics decide they’re not only going to compete in their chosen sport -– in this case, their unique form of rugby –- but they're going to do so more ferociously than anybody standing on two legs. "Murderball" is filled with vivid characters who have fascinating stories to tell about how they found themselves living on two wheels and how determined they are to roll over anyone or anything that gets in the way of what they want to accomplish in life. After you see it, you might want to steer clear of any preconceived notions about people in wheelchairs. (Think Film, in theaters now)

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