Get some sidewalk chalk and head outside. Start by drawing several shapes in different sizes and colors. Make sure the various drawings are close enough to each other that you can step or jump from spot to spot.
First move around from spot to spot pretending the ground is Lava (or water if that makes it easier to understand)
If your child easily navigates around on the spots you can play tag on the spots, follow the leader or assign one color or shape to each person that they have to stay on.
Most importantly, Have Fun!