Run more. That's about the best way to do it. The fastest gains you'll make early on are through doing it more often. After you start hitting a plateau interval training is the next step. If you've got a real need to accomplish it fast (the only reason I've ever seen this to be true is preparing to enter the military in short order) then interval training before the increased frequency will help but also ups the risk of injury and/or quitting the regimen.
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Strive to be more curious than ignorant.
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