The term 'strong back or chest' can be summarized as 'ROBUST, ' which is a six-letter word. ROBUST means having or exhibiting strength, durability, and stability. It is often used to describe physical strength, but it can also refer to mental or emotional strength. In the context of physical strength, robustness implies that a person has a strong back or chest, meaning they are able to lift heavy objects or perform strenuous activities without becoming easily fatigued.