I'm gonna sing lou-be-lou (step forward)
I'm gonna sing lou-be-light(step back)
I'm gonna give my right hand a shake, shake, shake (extend a hand, and do this, while stepping forward)
All on a Saturday night. (give a 360 turn as you say this, and step back).
Subsequent verses talk about the left hand, the right foot, the left foot, the arms, the legs, and then the whole self shaking (at which point all hell breaks loose for a second).
Shakers ordained this as a "Holy Song" in their liturgy. For those romantics who think that the theme to Ballet for Martha is typical of Shaker song, this comes as a bit of a shock...