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Anonymous
If you did not watch the 2008 Olympics, you would not know that the current world-record holder in some butterfly events is Michael Phelps. However, this can change everyday, considering that athletes can only get better.
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Ian Crocker long course 100 meters. Albert Subirats short course 100 yards.
He can do a 50 meter free in under 21 seconds. That's about 4-5 miles per hours if consistant.