To Gird your loins means to protect them. Your loins are you reproductive organs. If we use the bible expression "Put on the whole armour of God" then you are well protected.
Protect you loins in such a manner as to be the father of many children, again as the bible says "To have your quiver full".
Answer:The New Testament expression "gird up the loins" is directly related to the common manner of dress in first-century Palestine.
Men wore long outer robes that could impede movement or tangle one's feet. If they needed to be able to move more freely or quickly, they would tuck the hem of the robe into their belt and tighten it. This action was "girding up the loins."
As used in scripture, the phrase is a euphemism meaning, "Be prepared and ready for action." Its application is spiritual, not physical.
1 Peter 1:13 - Therefore gird up the loins of your mind, be sober, and rest your hope fully upon the grace that is to be brought to you at the revelation of Jesus Christ;[NKJV]
