Were you standing against the wall on New Year’s Eve, that old high-school feeling of angst rising in your stomach as you watched glamourous dancers twirling confidently around the room? If so, do not despair. All you need to do is enroll in a class at any one of hundreds of city dance studios, including those detailed below. All are open to individuals, so you are welcome with or without a partner. The skills learned can transform you into the star of next year’s New Year’s Eve ball and can help keep you trim and toned, à la the contestants on Fox’s “So You Think You Can Dance.” Latin or salsa dance is a good way to begin because, like learning Spanish, it has low barriers to entry and only starts getting difficult after you’re well into it.