I would compare what Blaine is doing to what Monks and Shaman do to impress the unwashed masses. Endurance can be considered a form of magic; if by magic you mean using supernatural forces to overcome physical limitations. Walking on fire, standing on a column for a long time, etc. these are all classic examples of things that Monks and Shaman do to "prove" that they are magic.
Don't get me wrong, I don't think Blaine is using "magic" to stay underwater for a week. That would mean I'd have to believe in the supernatural ... which I don't.
What we are calling magic these days (card tricks, sawing a person in half) is really better defined as "illusion" -- ie. not magic at all.
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