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The researchers compared the apes’ rope spinning speeds to human pirouettes in professional ballet and the turning of Ukrainian hopak dancers, Sufi whirling dervishes and suspended spinning-rope acts by circus artists.

Kateryna is a champion in kickboxing and has worked as a trainer for different forms of martial arts, including combat Hopak, a Ukrainian national dance that preserved certain combat elements, she explains.

The band members mix break dancing with Hopak, a Ukrainian folk dance, in an energetic performance punctuated by Psiuk’s rap interludes.

“I am ready to return to active service, or to be mobilized in territorial defense,” said the man, who gave his army nickname, Hopak.

He is keen to stress his Ukrainian identity: he has been photographed wearing a traditional Ukrainian shirt and has celebrated some of his victories by performing a traditional Ukrainian dance, the Hopak.