I think a lot of great dancing comes from within. Some people are naturally gifted, and enjoy (and are not intimidated by) moving their bodies. It does not, necessarily, take "dance training" to bring that out. A dance class here, and a dance class there can just add to your enjoyment of what you are doing. Watching some good and, sometimes, old movies can inspire you to not be afraid to try some of the moves. Now, your control freaks, and those who don't want to look anything but absolutely perfect....you can usually tell those people a mile off....just like you can tell the people who just really do it for the joy that they get from it, in addition to whatever training they may have. Jane is a perfect example of the serious dance training, with the balletic background...what she did required serious discipline. Sabrina's dancing comes from a place of joy, and it doesn't hurt that she is totally turned on by her partner. I'm sure she'd had some dance classes, but I'd be willing to bet that she hasn't been involved in the high discipline classes that Jane has, but she really loves movement.