physical fitness

Without training, it drops about 1% per year after age 30—10% per decade. But consistent aerobic exercise can slow that to 0.5% per year, or even reverse it. Strength training plus steady runs keep mitochondria firing and capillaries expanding.

The study looks at "walkability" – how conducive your neighborhood is to walking around.

Noting that about 30 percent of obese individuals are metabolically healthy (1), Dr.