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Good news: Whether you’ve been running for years or you just started yesterday, the stride you’re currently using — the one that feels the most comfortable and natural — is the most economical for you right now. A new study confirms what many of us felt (or hoped) for years: Our bodies are smart and want us to be comfortable (that’s a relative term) when we run. THE STUDY “We run at a natural frequency that our body wants to happen,” says Iain Hunter, a USA Track and Field consultant and professor of exercise science at Brigham Young University. He,…