The sound of slapping feet
If a runner has weak ankle dorsiflexors, you can often 'hear him coming a mile away', because his feet actually make slapping sounds against the pavement (of course, such a runner will be at high risk for MTSS, because the rapid downward movement of the foot will tear at and overstress the dorsiflexors). In contrast, the runner with strong, functional dorsiflexors will seem to pad softly along, even if he is running on rock-solid concrete. Watch some of the elite Kenyans running, for example, and compare their foot-to-ground patterns with those of elite Brits or Americans or the average recreational athlete. The Kenyans build up tremendous dorsiflexor strength and functionality because they spend their initial years of life running and walking endless miles while barefooted, instead of moving around with their feet clamped into fluffy midsoles which shield the feet from hard work - or sitting around with feet propped up on a soft hassock. As a result, the Kenyans waste very little energy during the stance phase of the gait cycle - and seldom hobble off the track or roads with a shin injury.