Fans of water polo and taekwondo – very possibly you enjoy watching both – are in for a treat this weekend with the first ever dedicated live radio broadcast of their favourite sports. Should be an interesting challenge for the BBC's commentary teams as they grapple with getting over the finer points of poomsae and makgi (that's the martial art – not water polo) and the eggbeater kick (that's water polo, not the martial art). Do they have an equivalent of football's "back to square one", perhaps? Radio 5 Live's digital spinoff station, 5 Live Sports Extra, will have commentary on team GB v USA in the water polo, and the European Taekwondo championships, both on Saturday, as it gears up for the London Olympics.