...that dancing "is a subject which always makes a lady energetic." So it is not completely surprising that he approaches her on that subject. I wonder if Darcy really (no pun intended--LOL) expected Lizzy to dance or whether he merely wanted to start conversing with her.

Another thought that occurred to me, and that perhaps JulieW could answer, is whether in a private home people might practice dance steps without a full complement of couples.