My own personal experience, but my 80 year old FIL changed a lot after he started going to dance classes. He was always in decent physical health, but prior to the classes he was a very stressed, unhappy, solitary type of person. Since then he's become much more extroverted, social, and generally happier.
Obviously I think the benefits are more than just the dancing itself, such as the community, but even when you ask him directly about what he thinks caused the change he points to dance classes.
Obviously I think the benefits are more than just the dancing itself, such as the community, but even when you ask him directly about what he thinks caused the change he points to dance classes.