In the last few years, the standard for every-day physical fitness has been the 10,000 steps a day rule. It's a simple, easy-to-measure, and popularly promoted measure of what it means to be healthy.

When it comes to fitness, walking remains one of the simplest (and most budget-friendly) low-impact ways to move your body — and for plenty of us, 10,000 steps a day is still the magic target. It’s a ...