I created the artwork and animation and did some programming for this series of games designed for patients with Parkinson's Disease at the UCSF Baker Center for Wellness with Red Hill Studios in Marin. The games encouraged patients to perform their prescribed exercise routine. It was challenging to provide the right kind of feedback about performance. A system of reward and punishment does not work in this context; the patients have various levels of motor impairment depending upon their genes.
I believe that with enough improvement in the quality of the data gathered from the patient, it would be possible to provide feedback about the improvement or degeneration of specific muscles and even nerves. Scientists at Rutgers and USC, among other universities have already achieved this level of precision in custom built input devices, and I can see Nintendo eventually getting there with a widely distributed commercial product.