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Grab a book on Plyometrics. Plyometrics, I've found, focus a great deal on the core and other smaller muscles in the body. They help with endurance, but probably not as much as with a true endurance sport like long distance running or swimming. Plyometrics also help out balance and agility.
I'm sure you can find a good deal of free information online as well.
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As soon as you stop living, you start dying....
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