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True endurance, I think, comes from the inside. It comes from motivation and belief in what you're doing.
— Neil Strauss
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The top fighters spar hard. They're really sparring for two reasons: One is to improve their technique, but the other, which is just as important, is to build endurance, toughness, and courage. They want to practice as realistically as possible so that when they go into a real fight, the transition isn't as jarring.
— Jonathan Gottschall
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