Our initial impression of what it means to be a man is that men are physically big and strong. As young children, we create a definition of manhood from our role models. The entertainment culture also lends itself to how we perceive physical strength.
God did create men to be physically strong, but we often tend to misuse our strength. We can be the physically strongest man in the world but still be overcome by spiritual attacks. Our spiritual strength should be greater than our physical strength. As a result, we can be closer with God and be spiritual giants that fight for those around us.