Ballroom dancing offers fitness gains - This is London [1] - [Salsa News Feed (Google) [2]]
As one who does a lot of ballroom dancing around L.A., I can tell you that most of the folks I run into are older, and in great shape. If you could see what I see, you'd understand why I believe that dancing is the closest mankind will ever get to a real "The Fountain of Youth".
Links:
[1] http://www.thisislondon.co.uk/news/article-23365701-details/Ballroom dancing offers fitness gains/article.do
[2] http://news.google.com/news?hl=en&q=salsa dance&ie=ISO-8859-1