A friend of mine who is a great dancer in general, latin and the other dances, is of a heaver build. his danceing ability and preformance is just as good or better than the long lean thin dancers. If your naturally not a long lean body type, dont worry too much about not being that way, just keep in good shape. if you are of taht body type, then good for you you have the "look" aready. as for toneing, regardless of body type, pilates is very good for the long lean type of muscles you seem to be looking for. it tones the muscles into the lean muscles of a dancer (thats how ive always heard it put). it is difficult to do at frist, but its worth it from what ive seen. good luck!