Having been to University in Wales and having a brother who plays rugby, I'm well aware that rugby players are not quite the same as the rest of us. But, even by their standards, standing in a small room in Poland with the temperature reduced to -110 degrees Celsius is just ever-so-slightly insane. So, if any of the English or Irish players shatter after a big tackle in the big Six Nations match this weekend, you'll know why - someone forgot to get fully defrosted after their cryotherapy.