Basically, they are fat deposis under the ass cheeks. It is not necessarly an indicator of a person not being fit or eating healthy because fit women can have them too. Exercise helps diminsh their appearance, but onyl plastic surgery can completely get rid of them.
Here is an example of a fit woman with a great body who still has a bit of bana rolls and cellulite:
I am asking because we never see them in the media. Everyone has perfect asses there. I always wondered why they never appear in the mass media but people don't complain about them in real life either.
You missed tge point. Your photo is not accurate. Find q picture of that model in different lighting and see how it looks. That is exactly why Linn looks different in the 2 pics