Just in time for the 80s Prom Party this Friday

(Photo: Doug Menuez/Corbis for New York Magazine) Though they may look (and sound) like Off Broadway send-ups, eighties-inspired workouts like Keightley’s are proliferating. Just as bat-winged sweaters and pegged pants are reappearing on runways, classic cardio burns from the eighties are back in fashion, too. The primary appeal: They’re simple and they make you sweat. …