>>11139000they can't. A mile tall human would die instantly. Blood pressure at the feet is high enough to burst the skin to say nothing of the difficulty for the hear to pump it up to the brain. Even if we use fucking magic here, it is unlikely they will be able to run. This is because the ground surface pressure should be so high that they start to sink. This is even more the case when running. When we run we are really just hopping from one leg to the other, which would make surface pressure much higher. More likely a mile high person would have to shuffle slowly around for many of the same reasons large pieces of machinery like the crawler transporter and mining equipment is slow.