YOU SAID:

I'll dance dance dance with my hands hands hands behind my head.

INTO JAPANESE

私は頭の後ろで両手を両手でダンスダンスを踊ります。

BACK INTO ENGLISH

I dance dance with my hands behind my head.

INTO JAPANESE

手を頭の後ろで組んで踊ります。

BACK INTO ENGLISH

Dance with your hands behind your head.

INTO JAPANESE

両手を頭の後ろで組んで踊る。

BACK INTO ENGLISH

Dance with your hands behind your head.