If you have ever seen Japanese girls dancing in a flurry of arm motions in tune with the music, you have experienced a popular Japanese solo dance called Para Para. These ordinary girls are able to remember complex dance routines and perform them in rhythm with other Paralist, as they are called.
If I had to compare it to anything we have over here in America, it would be like Country line dancing. However, unlike line dancing where the majority of the movement is done with the feet, Para Para is done with the upper body for the most part. Plus, Para Para is way more interesting to watch than line dancing.
Para Para has a few theories on how it all started, but one of the more widely accepted is the Wikipedia answer,
It has been speculated that it is a descendant of the traditional Bon Odori dance, though this is incorrect. The dance originated from the early days in the 80’s when men working in the VIP room in clubs would choreograph dances to impress the women. The dance style then grew from there.
Usually, the dancing is done to fast, up-tempo genres like Trance, Euro-beat, and Techno. There have been a few spin-off para para sub-cultures for different music styles. TraPara for Trance Para Para and TechPara for Techno Para Para are the popular ones. A group that calls themselves The Hinoi Team has become very popular with Paralists, and are innovating Para Para. Here are a few Para Para videos to entertain you.