Happiness is a group formed by 7 teenagers.all of them only 15-16 years old only.they were EXPG(dance school by EXILE) students.most of them learned dancing since kids especially the one who is the 2nd vocalist(more like background vocalist to me) who started to dance since 4 or 5?i don't remember.but she participated in alot of EXILE's concert and shows
and....ALL of them can dance!