For this game you need 4 or more people and some space.
The children get into either one or more groups of four and line up.
The first child in each line becomes a rock (do Child’s Pose), second student jumps over the rock and becomes an archway (do Triangle Pose),
Third person jumps over the rock, goes through the archway and becomes a bridge (do Downward Dog Pose). The fourth child goes over the rock, through the archway and under the bridge and becomes a rock, then the first child gets up and goes through the archway, under the bridge over the rock and becomes an archway and so the game proceeds until they get to the other side of the room.
If you have lots of children you could add more poses for them to go around, over or under.