It’s not even completely about their strength
And if I have to explain it....well you ain’t never gonna get it
But it is when it all comes down to it. M lovely wife loves me, but she cannot pick me up and carry to safety even if she wanted to. “A man has got to know his limits”.
As a 5’11” 190 lb man, I know that I can and have carried heavier men than I, but when the differential approaches 40% less strength per lb (female compared to male), and more than 40-80 lbs body weight, you know the answer.
150 lb female x .6 = 90 lb male equivalent, see it now?