The term 'Disco Activity' can be broken down into two crossword solutions: HUSTLE (6 letters) and DANCING (7 letters). HUSTLE is a type of dance that originated in the 1970s and is characterized by its fast-paced, energetic movements. It is often performed to disco music. DANCING is a general term for any type of movement to music, and it has been around since ancient times. In the context of disco, it usually involves couples DANCING together in a synchronized fashion.