> there's a lot of bending over and kneeling down - which I think we are becoming worse at as a species
I don’t think this is true, in general. Hard manual labor, combined with poor diets and poor healthcare left our ancestors with wrecked bodies by age 45–50.
Well, you might be right that overweight people can’t bend over or kneel down as easily as fit people. But the main thing stopping fit people from kneeling down a lot is that it's unpleasant (and we have neat inventions like ubiquitous chairs), not that we're less inherently capable than in the past.