Far more men like women with good-looking fit bodies. It's a statistically insignificant minority that likes "fat women", so "men" overall aren't policing women's bodies to the point of influencing women to not go to the gym. It's largely women who do it to each other.
>It’s a statistically insignificant minority that likes “far women”
Well, I’m not sure if that’s true, many men like “curvy” women, but generally even they are regularly working out. It would be more accurate to say that men dislike unhealthy women. But then you could say the same thing about men.