Anything you can do to make yourself more active is good, but treat these as recreational activities and don't count them as your primary exercise. Some people bike or play tennis or swim for fun, but they still run on the treadmill or lift weights. Dancing is great to burn calories, but try to not to look at it that way because you don't want to fall into the trap of using it as an excuse not to do other exercise. A lot of recreational activities tend to be stop-and-go so they're not as effective at burning calories as something like running would be. But definitely continue dancing if you can find the time. I've heard it will really develop your legs.