I have yet to read the methods used, but my low prior leaves me somewhat skeptical even after reading this article. The vast body of pre-existing material indicates "aerobic exercise" is the primary driver of health, with strength training obviously delivering some aerobic exercise too, but not nearly as much as some other forms of exercise.<p>The way these studies are described in the article, it sounds like they might have mislabeled a bunch of confounders as signal.<p>(E.g. people who regularly get aerobic exercise -- especially as they are older -- have greater muscle mass and are less likely to die. Heck, just that people exercise at all in any capacity is a signal of health, which lowers risk of death.)<p>Edit: That said, I believe some level of strength training is critical to avoid injury or overstressing particular muscles, even when your interest is primarily aerobic exercise.