Can it be ‘pumped’ along in still water?

I don’t know.   I strongly suspect that people will learn to do it.  – Of course it would also open up a vast new market if it can be fun in flat water like a swimming pool, but it will be a fun for fit young people – it will require youthful strength and stamina to pump your way across the surface.      Great show-off opportunity for the lads though – maybe they will use it as a macho way to get out through the shore break and white water or use it to catch and ride the wakes of river shipping…