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Parkinson's disease is a brain
that affects the
and muscles. It progressively causes unintended or
movements, such as shaking, stiffness, and difficulty with balance and
. People with Parkinson's may eventually have difficulties walking and talking. One of the most
people with Parkinson's was the heavyweight boxing champion Muhammad Ali. The researchers suggest that doing tai chi could keep
of Parkinson's at bay for years. They said: "The long-term
effect of tai chi on Parkinson's could prolong the
without disability, leading to a higher
of life, a lower burden for caregivers and a reduction in drug
."