It is to know basic language and counting and to be able to keep an 8/8 beat timing in your head since the challenge requires you say the numbers on their beat. For example: 8 is only said on the last beat while 1 is only said on the first beat. If you have good rhythm and practice it, then there's no challenge really. I still think this is better than a lot of challenges or dares though since those are all dumb dangerous things but singing the numbers 1 through 8 is just silly and harmless. This is actually a good short activity for vocal/singing practice. And, you don't have to follow the pattern in the video. You could do different patterns like for example 1 3 5 7; 2 4 6 8; etc etc