Ben Patterson (1934-2016), “From Methods & Processes: Stand Erect” (1962). Patterson was a member of Fluxus, and this is one of his scores. Check out this image of him leading this work.

Stand erect

Place body weight on right foot

lift left leg and foot with bent knee several inches above ground while balancing on right foot

extend left leg forward and place foot on ground, heel first, several inches ahead and to left of right foot

shift body weight to left foot

lift right leg and foot with bent knee several inches above ground while balancing on left foot

extend right leg forward and place foot on ground, heel first, several inches ahead and to the right of left foot

shift body weight to right foot

continue sequentially left, right, left, right until process becomes automatic