Pia says (14:47)
She is what we would (in swedish) call Smalfet

Pia says (14:47)
Smalfet basically means that a person is petite
doesn't have a lot of bodyfat
but has even less muscle
so they might end up looking "fat"
So yeah, her workout out and adding a couple of kilo of muscle to her body
could do a lot

Pia says (14:47)
to make her look more trimmed