There is this great Japanese TV program that seeks to answer ridiculous questions. The first time I saw a clip from this program it revolved around the question of whether a Samurai sword could really deflect .50 bullets. I was sure that no sword could do that, but it turns out that they can if the bullets strike the sword on its edge. Admittedly this effect only lasts for a couple of bullets before the sword is fatally weakened. But that is still pretty impressive.
The program below seeks to answer the question of whether the world champion fast walker would run or walk if his life was in danger.