Here’s a list.

https://www.thumbtack.com/instant-results/?keyw...

You could try a physical therapist..they are very trained for PD ..im going to one now for recovery of a spinal fusion but i also have PD and exercises for that are incorporated..only an hour 2 days a week but for him would be a nice slow start then when he builds up some stamina a personal trainer would be great..check your local YMCA that should help with info ...good luck 🌞🌴👍