Catherine Mary Stuart auditioned for the role of Alex in "Flashdance". She was deemed (as many others were) "too pricey" for her multiple talents. It was cheaper to hire Jennifer Beals and 3 uncredited dancers. Catherine has stated that she could have done ALL of the dancing/acrobatics in "Flashdance" without the use of doubles.
The dances were choreographed by none other than Mr. Nigel Lythgoe. Nigel is most famous as the producer and head judge on Fox TV's "So You Think You Can Dance." He was also the executive producer of "American Idol."