Hi, there,
In addition to the lists of benefits mentioned by some of our most knowledgeable and respected posters in this site regarding the subject, I say: "dancing is absolutely one of the best exercises there is!" Reason: All parts of your body move and, because of that, you will sweat a lot, especially if you dance the cha cha, jive, mambo/salsa, samba and swing, just to name a few!
Another benefit is that your social life will definitely improve as you will be able to meet a lot of people from all walks of life, young and old alike!
Happy dncing!!!
Roslaw