We don’t do it efficiently or effectively would be better than saying we cannot do it.

It’s only useful for going downhill quickly which we’ve all subconsciously or perhaps even mindfully done.

From your link:

> Gallopers exerted that effort unevenly, with the front leg doing more work than the back leg. And the galloping stride, researchers saw, demanded more from the hips than running did.

This tired people out quickly. Out of 12 treadmill gallopers in the study, 4 gave up before the end of their 4-minute session, complaining of fatigue and stress in their hips and thighs.

(An intended 13th galloper couldn't figure out how to gallop on the treadmill belt in the first place.)

When researchers calculated their subjects' metabolic rates, they found that galloping was about 24% more costly than running at the same speed. In other words, galloping burns up more energy, takes more effort, and is less comfortable than running.

It's no wonder we don't usually opt for it

I mean, this is a bipedal gallop, standing upright. What if someone were to train for running on both their hands and feet, the way a horse, dog, or cheetah does? I’ve seen a video of a young woman doing this, and it looked very uncomfortable/unnatural and it was frankly terrifying to imagine a human running at you in this way.

Mechanically it seems like the advantage would be using more muscles and being able to take advantage of your core and upper body when pushing off in addition to the legs. landing seems like it would be a challenge as fingers aren’t really made for that.