I think it’s less “prancing about in your pants” and more normalising the idea that female bodies don’t just look like the bodies young women are seeing on Love Island or among influencers, but that being muscular, strong and solidly built are just as much female body characteristics. Weight and strength training, for example, are some of the most valuable forms of exercise can women can do for their long term health; yet women are hugely underrepresented in them and a big factor in that is fear of “looking like a man” because we’re so used to seeing undressed female bodies that are almost invariably thin and waifish or with a focus on big boobs and big bums.
It’s not a perfect advertising campaign and there can definitely be criticism of it; but nearly-naked female bodies in the public eye aren’t going away any time soon, and I’d much prefer that young women were having an opportunity to see a far wider variety of them as admirable and attractive.