Has there ever been an athlete, male or female, quite like Simone Biles, the greatest gymnast of all time? She is like something from another planet, so out of this world are the body-bending tricks she can accomplish on the floor, vault and bars. These are incomprehensible feats of agility, strength and grace, which were once the territory of the communist countries who could bully their young athletes into doing all sorts of outrageous manoeuvres on lethal-looking pieces of equipment.