Is it a rain dance?
An artistic offering to the spirits of the sea?
A bizarre fitness craze?
A video of a man performing an unusual dance routine to the waves rolling up Swansea beach has viewers scratching their heads.
The footage, which was posted to Youtube by Jeremy Inglis Photography, shows a fit-looking man who appears to be in his thirties, and who may be sporting a police vest, doing a dance at the water's edge for almost two minutes, while walkers look on in surprise.
Do you know the mysterious dancer?
Is it you?