I think we all started exercising and lifting

Options
because we want to impress the opposite sex. guys want bigger muscles to impress girls and girls want slender bodies to impress guys. i dont think that it's ever a crime to improve yourself.

everything we do in life somewhat correlates to the idea of wanting to impress the opposite sex being it is making more money, driving better cars, and dressing better so we could all find a great person to mate with.