The fixed, firm part of a body, which supports it or gives it strength and solidity; as, the bones are the stamina of animal bodies; the ligneous parts of trees are the stamina which constitute their strength.
Whatever constitutes the principal strength or support of anything; power of endurance; backbone; vigor; as, the stamina of a constitution or of life; the stamina of a State.
Sometimes we may ask God for success, and He gives us physical and mental stamina. We might plead for prosperity, and we receive enlarged perspective and increased patience, or we petition for growth and are blessed with the gift of grace. He may bestow upon us conviction and confidence as we strive to achieve worthy goals. David A. Bednar
I think it's nice to age gracefully. OK, you lose the youth, a certain stamina and dewy glow, but what you gain on the inside as a human being is wonderful: the wisdom, the acceptance and the peace of mind. It's a fair exchange. Cherie Lunghi
Chess as a sport requires a lot of mental stamina, and this is what that makes it different from a physical sport. Chess players have a unique ability of taking in a lot of information and remembering relevant bits. So, memory and mental stamina are the key attributes. Viswanathan Anand