Practice sitting on an invisible bench.
Two workers come in and pretend to lift a bench.
Worker1-Let’s move the invisible bench over there.
They move the bench.
Worker2-Let’s get a soda.
The boys come in and squat down to “sit” on the old bench spot. They cross legs, etc. They read, play games,etc. The workers come in with cups.
Worker1-What are you doing?
Boy1-Sitting on the invisible bench.
Worker2-‘Cause we moved the invisible bench over there.
The boys fall down in unison.