Science analyzes move-busting.
"It's rare that someone is described as a good dancer if they are flinging their arms about but not much else," said Nick Neave, a psychologist at the University of Northumbria, who led the study.
"Think about a head banger. Their head movement has a large amplitude, but it's not changing direction or showing any kind of variability. That's a bad dancer. Or someone who is just twisting and turning left and right? That's a bad dancer too."