Harvey Weinstein popped into the Equinox Printing House gym in the West Village, but it wasn’t to work out. Instead, he strolled into the sweat box in “a sharp-looking suit,” spies said, to visit the set of his Sarah Jessica Parker vehicle, “I Don’t Know How She Does It.” “He was extremely jovial,” our spy added. “He was in a total fun-loving, relaxed mood. He took off his jacket, and his shirt was untucked. He was friendly to the cast and crew and was extremely loud when he laughed.” The film’s director, Busy Philipps, blended in meanwhile by dressing the part of a gym rat.