Want to Live Longer? Start Walking — Quickly There is certainly no shortage of sophisticated machinery that can measure how healthy you are, fro…

There is certainly no shortage of sophisticated machinery that can measure how healthy you are, from scanners to genetic and molecular tests that can expose the inner workings of your cells, but doctors may soon be relying on something far simpler to gauge your well-being. Don't be surprised if at your next checkup, your physician asks you to take a stroll.