What is your definition of "weak"? When it comes purely to physical strength, men are usually stronger (scientific fact, sorry girls, don't be mad at me. Also the reason why women have their own divisions in sports), but there is more to strength than physical strength.... Mentally women are quite often stronger than men, and women are often also better in enduring pain. We THINK they are not as women don't make a secret of their pain and mental issues, where men quite often do, but hiding weaknesses does not mean you don't have them.
Of course, one kick in the groin and a man passes out (in extreme situations the pain can even kill him), and although women shared with me that a kick on that spot is still painful for a female, things will normally not turn out that extreme.
"This is a man's world, but it would be nothing without a woman by your side". It is true that humanity would never have achieved the things we did without women, and that their role has quite often even been bigger than that of the men, but with the men stealing the spotlight, we do not always know this is the case. And women could never have played this (however underrated) important role if they were weak.
No I am not saying this to please the ladies (I'm a guy myself after all). I am merely stating things the way they are.