PHOTOS | Race walking is a 50K 'world of hurt'

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Canadian race walker Evan Dunfee, who referred to his event as a 'world of hurt,' turned down an opportunity to counter-appeal for a bronze medal after a controversial bump in the final stretch of the 50K race. Here's a look at the gruelling event that is Olympic race walking.

PHOTOS | Race walking is a 50K 'world of hurt'