Well, that’s not true. I just wanted to grab your attention. I’m sure there are plenty of Japanese that can dance just almost no Japanese can dance Hip Hop. I’ve noticed this since I first got here 6 years ago and I think I finally figured out the reason.
The reason is they don’t know why they are dancing. More specifically, most Hip Hop and related dance is about sex. The songs are about sex so the dancing is influenced by that. Through the dance the dancer is trying to turn you on or at least express the sex in the song. But, Japanese J-POP hip hop copy songs are not about sex and even if they are dancing to western hip hop they don’t understand the lyrics therefore they don’t know with what feeling they should be dancing and they don’t come up with the same types of moves.
At least that’s my theory. 
Last week a friend invited me to a hip hop exhibition / competition. It happens the second Tuesday of every month at Core in Roppongi. I told her this theory of mine. After the exhibition I asked her if she thought any of them *got it* and we agreed of all the dancers only one had western moves. I wonder if she spoke English
Well well well…what a arm wrestling!!
What a non-sense.
Of course there are Japanese people who can dance, full stop.
Probably it is all a matter of style.
Let me give you an example. Do you know all latin american dances?
Like salsa, reggaeton, bachata,etc.
THEY are actually about sex, but it is in a very natural way.
Not all south american knows about 100 moves, but they have the proper rhythm (NOT all of them, but most of them).
Try to see an Italian, a French or a Spanish, they have latin cultures, because it is more likely that they are able to dance this kind of music.
Well, let me tell you that, although they can be very good, they won’t be as good as a south american of the same level of expertise. Because a South American grows up with this dance culture. Culture and dance are very much linked, so when a Spanish dances, he/she lacks of the culture background of the dance. And for a South American it is quite weird to see not South american dancing their stuff.
Probably it is what happened to Japanese dancing Hip Pop and American watching them. Japanese can be good but they miss the culture background (I am not talking about those dancing from the age of 0).
And I am not so sure Hip Pop is about sex.
The link between HP and sex exists, but only because that music(and music in general in crowded public places) has become an easy way to meet people in “that” way. And who is complaining?
And what about lyrics? Well, they are maybe a consequence of the way of dancing, or a consequence of a easy way to impress young people and to sell records.
ViVa CHiLe