In this, your fingers eimply walk up from your toe to your head and back down again, and then get a playful slap at the end.
On my toe there is a flea,
Now he’s crawling up on me,
Past my tummy, past my nose,
On my head where my hair grows.
On my head there is a flea,
Now he’s crawling down on me.
Past my tummy, past my knee,
On my toe . . . TAKE THAT, YOU FLEA!
I sometimes use this to illustrate up and down to help them to discern up from down in a scale.