Any exercise that involves repetition enhances mental well being and memory. Line Dancing in particular has been shown to help with mental health, fighting depression and helping to improve problems with thought blocking and memory.
But Line dancing is so much more than that. It helps maintain good coordination , improves balance thus opening the doors to self confidence. Muscle memory and cognitive improvement are noticeable making this an ideal activity for young and old.
Learning new routines creates a sense of accomplishment and enhances all the other benefits that this physical activity brings. And its much more fun than simple repeat exercise in the gym.