A few weeks ago, I went over 7 of the most important longevity biomarkers to track. Today, I’m shifting gears a bit. The theme remains longevity markers, but the markers I’ll discuss today are subjective, logistical, and psychological ones. A couple involve physical sense but you can’t measure these with a blood draw or a lab scan. The only way to assess your standing is through some genuine self-experiment and honest soul-searching. Or by, in one case, running a mile.

(This Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Leaman)