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Keep in mind running like Naruto is not the proper way of running, and may cause injury. People usually run with their arms and legs pumping in unison to make each step more powerful. In the Naruto series, characters often have their hands and arms straight out behind them to decrease air resistance. They have been training for years to increase their leg strength, so they do not need the extra power given by thrusting. You can imitate this run, but you won't be able to do it as well as Naruto: a non-existent power (called Chakara in the series) is used to increase their leg strength to make this running style effective. To visually imitate Naruto's ninja run, you just need to lean forward while running and hold your arms straight out behind your torso.