Learn some prepositions of movement.

What's she doing?
She's walking down the stairs
What's he doing?
He's walking up the stairs
What's he doing?
He's flying over the cloud
He's flying under the cloud
He's flying past the cloud
He's flying through the cloud
He's flying around the cloud
He's riding a bike into the cave
He's riding a bike out of the cave
He's running towards the dragons
He's running away from the dragons
He's jumping off (of) the bridge*
He's jumping onto the bridge
He's running across the bridge

*In American English you can say "off of...", but in British English you say "off..."