_commerce, _seo, collection: runner's world+ story previews, collection: runner’s world+ exclusive, collection: running tips, collection: strength training, collection: weight loss, content-type: default, content-type: how to, content-type: how-to & service, displaytype: standard article, hasproduct: true, issyndicated: false, issyndicated: true, locale: es, locale: gb, locale: it, locale: us, shopping, web, read_time: 10, sponsored: false, shorttitle: older athletes’ secrets to running longevity