Yes, Our Ancestors Swung Around

 In the 19th-century, anatomists decided (those who believed in evolution) that we and the other apes descended from a common ancestor that swung through the trees.

Brachiation is used by chimpanzees and bonobos, and gibbons are highly evolved for it (extremely evolved in fact).

But more recently somebody tried to argue that we ran along the top of branches. On the face of it, this is ridiculous. There's a thing you need to do that safely that most apes lost a long time ago, namely a tail.

Without a tail, it's really hard to do that. Probably why sloths, who also lack a tail, prefer to move along the underside.

Now somebody's looked at a hand of an ancestor and come to the conclusion that we were right the first time. We probably swung around, and that gave us the beginnings of the bipedal stance and the ability to lift our arms all the way up...quadrupeds generally can't do that.

Dunno why it was even an argument, but it seems to be settled.