The problem is the 'are you beach body ready' slogan, combined with the image. It suggests, in a highly toxic and old-fashioned way, that women are simply there to look good for an (implicitly male) viewer. And that, if they are not, they should cover up.
The fact that the message is internalised, and plays on insecurities, is testament to the way in which women still today suffer from discriminatory gender messaging.
Now before someone completely clueless posts a picture of a male model in similar pose - IT IS DIFFERENT. Due to the fact that there is a history of, uh, around 3000 years of women losing out massively due to being treated as nothing more than possessions/objects for the male gaze. There isn't a symmetry between the genders culturally or historically, and there so there isn't one in terms of visual politics either.
It has nothing to do with health AT ALL: the product is not 'healthy'. It's not a goddamn advert for an apple, FFS.