This is a useful variable to employ when you have directional information to convey (up or down, backward or forward).
I would like to use a picture (to describe) : a bridge from one bank of a river to the other side, where you cn walk back and forth.
Take two steps forward and two steps back.
In the first three beats, the dancers move forward, backward or around; while in the latter two beats, they clap their feet or hands in their original places.
Took two steps back for every step forward.
crash ahead maneuver
No retreat is allowed only advance.