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Barrel chest medically means a rounded expanded rib cage from chronic lung hyperinflation, mainly in emphysema or COPD where air gets trapped and pushes the chest wall outward. It can also tie to aging or arthritis.
The left drawing shows the classic version. Elons right-side photo shows a muscular torso in profile with forward chest projection. That shape comes from pectoral and upper back muscle growth through resistance training, his tall broad frame, and normal middle-age factors like posture or tissue.
No evidence of lung disease. Its a common athletic build exaggerated by the side angle and meme comparison.