The thrill of ice canoeing on Canada’s St Lawrence river

Quebec’s semi-frozen St Lawrence river is the fearsome setting for a form of canoe racing that involves going over, as well as around, giant hunks of ice.Plus: more winter extreme sports to tryI’m knee deep in gaffer tape. Rolls and rolls of the stuff have secured two chunky ice-hockey shin pads to my Lycra-clad legs, and I’m wearing shoes that have been meticulously customised with dozens of tiny metal screws to stop me slipping. Before me, the St Lawrence river is a treachero