Often used as a preliminary exercise as a warm-up.
Improvising music on the piano in different tempi and with different locomotor rhythms (above). Children follow with the appropriate movements. On a signal (musical/verbal) they do the locomotor movement backwards. Any pupil who misses the signal will have a little surprise when he continues marching forward while everyone else is going backwards!
Combine this exercise with stop and start, so if the signal is given when they are stopped they have to remember which direction they were going when the music resumes.