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Parkinson's is a brain
that affects the nerves and
. It causes
or uncontrollable movements, and
with balance and coordination. People with Parkinson's may have difficulty walking and talking. One
person with Parkinson's was the heavyweight boxer Muhammad Ali. The researchers said tai chi could keep
of Parkinson's at
for years. They said: "The long-term beneficial
of tai chi…could prolong the time without
, leading to a higher quality of life, a lower
for caregivers and a reduction in drug use."