Muscle March - Japanese Wii game

I don't really understand some Japanese games. I remember there was a Japanese arcade game where the whole object was to poke a computer character in the butt and this Japanese slot machine (Pachislo) called GeGeGe no Kitaro - based on a boy who lost his eye, lives in a grave yard and fights ghosts.

But the strangest game of all is for the Japanese Wii. It's called Muscle March and as far as I can tell, the object is to run behind body builders and imitate their muscle moves while avoiding running into walls. Anyway you can see the video for yourself.