Synchronised swimming isn’t really a sport, is it? It’s ‘artistic swimming’ now, of course, though many athletes don’t like that term precisely because it makes the Olympic event sound less like a real sport. But by the end of Swimming Pretty, Vicki Valosik’s meticulous history of synchronised swimming, it’s difficult to think of it as anything other than one of the toughest sports we’ve been watching in Paris – and wonder why anyone would disagree.