This is a great song for mixed meter. The body percussion is something my students helped me to create as when I first taught this I had a class that struggled with the feeling of 2 vs 3 so we quickly devised some body percussion patterns to reinforce that feeling. It stuck! Once the song is learned, students can play the game:
Class stands in a designated area, each facing a partner.
Sing song, performing body percussion. At end of song, students tap one hand in a fist onto the other hands open palm on "one, two, three, four" and on "five" they reveal rock, paper, or scissors.
Those who win stay in the designated area and find a new partner, all others circle around them. Everyone sings again, performs the game with new partners, winning partners remain to find new partners, etc. until there is one winner. My students beg to play this game and it is a great one when you need a quick 3-4 minute activity or brain break.
This song and game makes a great addition to a unit on Japanese music.