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