'If you stand still, you're gonna get your ass run over': Kaillie Humphries - Unstoppable
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Winning Olympic gold is hard enough. Defending it 4 years later, even tougher. Now, Kaillie Humphries - Canada's top bobsleigh driver - wants to do what no Canadian has ever done. Win a 3rd consecutive gold in an individual event. This is her push for glory. Watch now.