Many dancers and non-dancers complain of back pain, much of it due to poor posture. As a dancer and anthropologist I found this article very interesting. http://www.npr.org/sections/goatsandsoda/2015/06/08/412314701/lost-posture-why-indigenous-cultures-dont-have-back-pain
The posture Esther Gokhale speaks of is what dancers have used for hundreds of years. Finding this proper posture not only makes dancing easier it allows for pain free movement. Remember if you are experiencing great pain you are probably doing something wrong. See your teacher for an evaluation of posture and movement. With proper conditioning and training you can dance pain-free. Check out http://danceproject.ca/ for specifically designed exercises for dancers.