Belly Dance has offers tremendous health benefits, and this web site details many of them, including:

Back and joints pains are relieved
Bone density increases
Belly dance is a low impact form of exercise
Belly dance helps in loosing weight
Belly dance helps in preparing for childbirth
Stress levels become lower
Belly dancing boosts self-esteem
Belly dancing can help relieve PMS

Check it out at http://www.worldbellydance.com/benefits.html.