Puffa jacket lost its puff!

[TheGirlOnTheLanding]

Suggestions for getting it back?

I machine washed a down filled jacket and it has dried flat as a pancake - to the point I was checking for holes in the seams and feathers in the washing machine. Will washing it again followed by tumble drying sort it out? Any other thoughts?

Have you given it a good shake?

Bicycle pump?

Tumble dry it with a couple of tennis balls. Put a small slot in the tennis balls first, not sure why, I've always done it! It puts the puff back in a lot of things. Coats, pillows etc.

Tumble dry it with a tennis ball

Slit not slot! Just stab them with a knife!

Thank you all (and sorry for unintentional double post) - off to purchase tennis balls tomorrow then.