Parkinson’s progression may slow with four hours a week of exercise, study says

Parkinson’s, which is more common in men than women, usually begins about age 60 as nerve cells in the brain (neurons) become weak or damaged. Symptoms may include trembling or shaking (tremor), muscle stiffness (rigidity), slow movement (bradykinesia) and poor balance and coordination. As symptoms get worse, people may have trouble walking, talking or continuing to do routine daily activities.