I didn't post it but if you google his first sentence,
Parkinson's disease (PD) is common, age-dependent neurodegenerative disorder caused by a severe loss of the nigrostriatal dopaminergic neurons. Given the projected increase in the number of people with PD over the coming decades, interventions aimed ...
www.ncbi.nlm.nih.gov
"Epidemiological data indicate that exercise may reduce the risk of developing PD. There is now a convincing body of clinical evidence suggesting that PA is beneficial, cost-effective, and low-risk intervention that improves overall health and provides promise for improving both motor and non-motor symptoms in PD."
I suppose the main takeaway is exercise is good.