they clack together two halves of split open coconuts to confuse the enemy

So you think centaurs are always going to fight someone? That’s racist.

Where’d they get the coconuts?

In all the media I’ve seen the arms basically just stay in place, half bent.

I was about to say, “Holding a bow and arrow”

So you think centaurs are always going to fight someone? That’s racist.

A swallow could’ve carried it

Hmm, humans swing their arms while running to counteract angular movement. Presumably, the horse undercarriage wouldn’t have this problem, because there’s more legs in an offset motion and just some distance between the pairs of legs to hold the body straight.

But horses nod their heads during gallop, so maybe the centaurs would do a little chug-chug motion with their arms instead.

they hold them out in front of themselves like they’re holding motorcycle handlebars and they make the sounds with their mouth

I have visual references

Maybe they Naruto run while galloping

With the whole upper half bobbing up/down like a horse nodding it’s head while it runs.