You seem more concerned for your visual discomfort. Rather than curbing obesity linked diseases. Obesity is multi-factorial (not merely about calories in and energy expenditure) but also relates to the types of food consumed, the state one is in when consuming them, food timing, stress levels, habits, hormones and feeling/emotions etc. In fact, a large proportion of those with weight problems have some underlying adverse chronic experiences (ACEs) aka trauma of some kind. Focus on the habits and the feelings first. Also you did not frame this as a public health concern despite your 'seriousness'
I would rather you love the sisters to wellness than beat them down with buuq and calcaal like you boys vehemently do. Lift them up. There also seems to be a trend of girls hitting up the gym. Now more than ever so this might be a perceptual gap. If I wanted someone to go to the gym with me I would try to make them feel comfortable and not out of place. And remind them that everyone has a starting point. There will always be a point where one feels a sense of overwhelm but do not despair and compare. The aim should be to improve quality of life, energy levels and giving more to ones loved ones. Or whatever driving force/chief aim they have.
You don't even know women over 30. And even if you did you would not be able to recognize them.