The term flexibility is from the 1610s, of physical things, from French flexibilité (in Old French, "weakness, vacillation") or directly from Late Latin flexibilitatem (nominative flexibilitas), from Latin flexibilis "pliant, yielding." 

Flexibility in life will extend life. Change encourages flexibility in thoughts and actions. Control what you can. Stay ahead of the waves coming at you. Being flexible does not mean "folding like a lawn chair." Flexibility means yielding when necessary. You will know necessary when you see it. 

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A deeper friendships, wide and bright crevasse of love, watching each other