What Makes a Man 'Strong' to a Woman?

What makes a man strong in a woman’s eyes? Is it him going above and beyond for her – or is it something more primal and elemental than that?

Strength is one of the most pivotal qualities of a man.

A man’s strength makes him attractive to women. A lack of it repels them.

A man’s strength reassures women. A lack of strength alarms them.

A man’s strength causes women to follow him. A lack of it makes them abandon him.

Clearly, it’s vital as men that we maintain strength if we want things to go well for us with women (instead of the opposite). But what IS strength and how do women measure a man’s?