1: “The strong association between cardiorespiratory fitness and longevity has long been known,” Dr. Peter Attia writes in his powerful book Outlive: The Science and Art of Longevity. .

What may be more surprising is that our strength is also powerfully correlated with living longer.

“A ten-year observational study of roughly 4,500 subjects ages fifty and older,” Peter writes, “found that those with low muscle mass were at 40 … continue reading