The brains of ballet dancers can physically adapt to spinning around. 

A new study by researchers at Imperial College London has found signals between the inner ear and the brain that normally cause dizziness appear to be suppressed in longtime ballet dancers. 
This new information may help patients who experience chronic dizziness. One in four people get the condition at some point in their lives, and once doctors figure out how ballet dancers' brains suppress the signals, they'll be able to develop a treatment for chronic dizziness.
--Rob Archer