Task: Explanation
Input (English): Pole dance combines dance and acrobatics centered on a vertical pole. This performance art form takes place not only in gentleman's clubs as erotic dance, but has also recently gained popularity as a mainstream form of fitness, practiced by many enthusiasts in gyms and in dedicated dance studios. Amateur and professional pole dancing competitions are held in countries around over the world. Question: Chinese poles have been used for the dancing that has recently gained popularity as a mainstream form of what activity? Answer: fitness
Output (English):  This performance art form takes place not only in gentlemans clubs as erotic dance, but has also recently gained popularity as a mainstream form of fitness, practiced by many enthusiasts in gyms and in dedicated dance studios.