Parkinson's disease has diminished his voice and slowed his body, but Muhammad Ali still exercises regularly in a gym at his home in Berrien Springs, Mich., punching a heavy bag and sometimes sparring playfully in a boxing ring, his wife says.

He hasn't driven a car in 15 years and "he's no longer the type to pick up the phone and call friends the way he used to, but we converse," his wife, Lonnie, said in an interview in the March-April issue of Neurology Now, an American Academy of Neurology magazine for patients, their families and caregivers.

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Ali, 64, was unable to walk unassisted but still spirited in November when he was awarded the Medal of Freedom by President Bush.

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