2020-07-26 The Power of One Push

The push-up study could reasonably extend beyond firefighters. “Push-ups are another marker in a consistent story about whole-body exercise capacity and mortality,” says Michael Joyner, a researcher at the Mayo Clinic whose work focuses on the limits of human performance. “Any form of whole-body engagement becomes predictive of mortality if the population is large enough.”
That is to say: Health is not simply about push-ups. There’s also nothing magic about grip strength or walking speed. But these abilities tend to tell us a lot. Firefighters with higher push-up capacity were more likely to have low blood pressure, cholesterol, triglycerides, and blood sugar, and not to smoke. People with the lowest grip strengths were more likely to smoke and have higher waist circumference and body-fat percentage, watch more TV, and eat fewer fruits and vegetables.
Essentially, these quick metrics serve as surrogates that correlate with all kinds of factors that determine a person’s overall health — which can otherwise be totally impractical, invasive, and expensive to measure directly. If we had to choose a single, simple, universal number to define health, any of these functional metrics might be a better contender than BMI.
A good metric of health should be meaningful, measurable, actionable, and durable. Body weight and BMI aren’t always meaningful or actionable — as many people who’ve tried to change theirs are aware.