In previous years one of them had apparently played ice hockey.
I think the key is that none of them have done any sort of ice dance. The programme is after all a bit of light entiertainment. Surely we are watching as much to see some perform well (and much better than most of use who slip and slide the moment there is a bit of ice on the pavement), and of course gleefully hoping that one of them is going to mess up and go head over heels
