"IN! OUT! SIDE! SIDE! ON! IN! OUT! SCISSORS!" After you complete that the people inside the ropes move the elastic up to their knees. In out side side on in out scissors. If you complete that they move the elastic up to their thighs.
Jump Over Rope -- Lay a rope on a flat surface, then ask the children to jump back and forth over it.
You can use these activities for Montessori walking the line lessons. The next natural step is jumping rope.