Hey! We had a similar game in Britain. Or at least in our playground.

Con-cen-tra-tion
Concentration motivation
keep the rhy-thm
okay, let's play.

and everyone had a number or name or word, sometimes we used swear words.

and then doing the hand rhythm where you pat your legs, clap your hands, and then throw thumbs over your shoulders you say your number/word and then the word of the person you're sending it to.

I can't remember all of the rules, but I think you just weren't allowed to stumble over your words. It got faster as it went on. And eventually everyone was out except the two facing each other who just had to go faster and faster until someone stumbled.