This is impolite and self-aggrandizing of me, but for years and years there has been plenty of talk and observation about what kind of dancing works : it is what works for you. So, for example, one study simply used the Tango, because it is the most difficult for anyone with a movement disorder.

Do not attempt to read all of these, as it is just too much to read, but look at the beginning of each one and read a little of the beginning of each one and its seems that the dancers have not been listened to enough by the neurologists; and everyone’s reaction to dancing as therapy is very individual, making it hard for science to quantify.

Dancers talk about neurology more than neurologists talk about dancing. The neurologists are imbalanced :
http://parkinsonsdance.blogspot.com/...chapter-9.html

Thesis, Antithesis, Synthesis
Dancers and Neurologists get together
http://parkinsonsdance.blogspot.com/...hapter-11.html

A major evolutionary benefit : THREE SECONDS WATCHING THE DANCE, AND YOUR BRAIN LIGHTS UP
http://parkinsonsdance.blogspot.com/...hapter-12.html

It takes two to Tango
From Argentina, with love
http://parkinsonsdance.blogspot.com/...hapter-13.html

ALEX KERTEN TAKES A HARD LINE
AGAINST PARKINSON'S DISEASE
http://parkinsonsdance.blogspot.com/...hapter-15.html