Exercise boosts motor skill learning via changes in brain's transmitters - Neuroscience News.
Summary: Neurons in the caudal pedunculopontine nucleus, an area of the brain that regulates motor coordination, switch neurotransmitters from acetylcholine to GABA as a result of exercise. The switch appears to provide feedback control that regulates motor coordination and skill learning.
Exercise enhances motor skill learning by neurotransmitter switching in the adult midbrain | Nature Communications: from acetylcholine to GABA.
Open access.
This is a really interesting study. A strong argument for exercise. Thanks for sharing it.
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I've been reading about the benefits of Forced Exercise and exercise rate on bicycles and its effect on PD symptoms. 
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