<P> The tight schedule allowed only two weeks for rehearsal and 44 days for filming, as it was already the tail end of summer . The cast stayed in the same hotel at Mountain Lake Lodge in Pembroke, Virginia and at the 1927 Lake Lure Inn & Spa in Lake Lure, N.C. Rehearsals quickly turned into disco parties involving nearly every cast member, even non-dancers such as Jack Weston . </P> <P> The dancing and drinking went on almost non-stop and, immersed in the environment, the lead actors, Grey and Swayze, began identifying with their characters . Bergstein built upon this, encouraging the actors to improvise in their scenes . She also built the sexual tension by saying that no matter how intimate or "grinding" the dance steps, that none of the dancers were to have any other kind of physical contact with each other for the next six months . </P> <P> Filming started on September 5, 1986 but was plagued by the weather, which ranged from pouring rain to sweltering heat . The outside temperature rose to 105 ° F (41 ° C), and with all the additional camera and lighting equipment needed for filming, the temperature inside could be as high as 120 ° F (49 ° C). According to choreographer Kenny Ortega, on one day 10 people passed out within 25 minutes of shooting . The elderly Paula Trueman collapsed and was taken to the local emergency room to be treated for dehydration . Patrick Swayze also required a hospital visit; insisting on doing his own stunts, he repeatedly fell off the log during the "balancing" scene and injured his knee so badly he had to have fluid drained from the swelling . </P> <P> Delays in the shooting schedule pushed filming into the autumn, which required the set decorators to spray - paint the autumn leaves green . The uncooperative weather then took a different turn, plunging from oppressive heat to down near 40 ° F (4 ° C), causing frigid conditions for the famous swimming scene in October . The crew wore warm coats, gloves, and boots . Swayze and Grey stripped down to light summer clothing, to repeatedly dive into the cold water . Despite her character's enjoyment, Grey later described the water as "horrifically" cold, and she might not have gone into the lake, except that she was "young and hungry". </P>

Who is baby's sister in dirty dancing