Push it to the Limit

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I remember hearing someone tell the story of when a runner broke the record for the fastest time for a mile. I believe it was 4 minutes if I'm not mistaken. Anyways, as soon as this guy broke the record, people were doing the exact same thing all over the U.S., even though it was said to be impossible. By breaking the physical record for the mile, the runner also broke the mental limit that other runners had subconsciously put upon themselves. Do you think this still happens today? Are we running as fast, jumping as high, or using our brains as much as we could?