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Barefoot can be used as an adjective and an adverb.
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No but he ran without blocks for a while.
Barefoot running has been associated with lower leg pain but most barefoot runners think this has to do with starting out too quickly. There are shoes to help with the transition to get your body used to the change of stride and to help alleviate any pain.
There is no real difference. Its just a different way of saying the same thing. "Barefooted" is more commonly used in the southern United States than in other places. "Barefoot" is more common in non-southern locales although the slightly more sophisticated "barefoot" is sometimes used in southern locales as well.
No, running around barefoot will not cause you to get flat feet. Shoes are only used to protect our feet but we were born to walk on our feet without anything on them.