Why running demands more from each step
Walking keeps at least one foot on the ground, so the body can move forward in a relatively continuous way. Running includes a brief airborne phase: the body rises, then lands and must be supported again. Muscles and tendons absorb and return some of that landing energy, but the legs still have to generate substantial force to propel and stabilize the body.
That repeated push-off and landing makes running more demanding for the muscles than covering the same ground at a walk. The extra effort is not simply a matter of moving faster; it comes from the mechanics of running itself.
Faster burn is not the same as a longer workout
Running usually uses energy at a higher rate, so it burns more calories per minute. But the comparison changes when the distance is held constant: a run takes less time, which partly offsets its greater energy use per minute. Even so, running generally requires more energy to cover that distance than walking does.
The difference varies with a person’s body, pace, terrain, and movement efficiency. On a steep path or rough ground, for example, walking can become strenuous. The practical takeaway is that running is a more energy-intensive way to cover ordinary ground, while walking can achieve the same distance with less effort spread over more time.
