I'm afraid, trisher I'm finding your story of women having the strength bred out of them because of male cultural expectations to be a trifle fanciful and historically inaccurate.
While it 'may' have been true of women who could afford servants to perform all the physically taxing work of a household (many of whom would have been women themselves and so doing the physically taxing work) there wasn't much featherbedding for most women. Women cultivated fields alongside men, they carried water, they cleaned and fetched and carried; in addition to being frequently pregnant or having a baby to carry around.
Gauging women's historical 'strength' by their ability to fight in battle feels like a a curiously masculine viewpoint to me. There are more ways to become strong than training as an Amazon.
A wee example from those high Victorian days of 'helpless women. The little town I live in had a postwoman who walked the 10 miles to Durham city every morning to collect the post, walked back, walked her round to deliver it, then did it all over again in the afternoon so as to take local letters to the main post office and come back with the second post of the day to be delivered. By my reckoning that was somewhere in the region of 50+ miles a day, plus carrying the post bag (which may, or may not, have been heavy ). While it's a bit extreme it would be equally common for women to walk distances for marketing.
Or perhaps we could look at the lives of women servants in great and small houses who did the scrubbing, the laundry, the carrying buckets of coals upstairs for fires, or hot water for their mistresses' ablutions. Perhaps you know of the rather creepy 19th C guy, Munby, who married his maid of all work and wrote admiringly of her strength and brawny arms. He was rather keen on photographing fisher girls, another breed of brawny women; he especially like them to carry him across wet sand...
Please don't tell me that women were weak and feeble creatures for a couple of thousand years, because, on the whole, they weren't.