What's she doing?
She's riding a bike.
What is she doing?
She is taking riding lessons. (She's riding a horse.)
Where are they going?
They are going hiking.
What's she doing?
She's swimming.
What's he doing?
He's making a sandcastle.
What is she doing?
She's eating (ice cream).
What is she doing?
She is reading?
What is he doing?
He's getting up.
What's this?
Go camping