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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.

    "A Talk With The Savage English Professor". Interview with Sam Harris, www.thedailybeast.com. March 5, 2015.