How to become  strong ??

Well there are different answers for men and women on the internet.

Personally, it's never been a problem for me as long as I'm with the right woman.  (And I am male.)

Aggressively test your limits. Challenge yourself to do the difficult. Overcoming adversity is a mark of strength of one's character.

Conditioning works in all forms.

Muscles, bones, and even the brain . . . Push yourself just passed the limit, and that limit will extend over time to compensate . . .