Plural of 'lat,' short for latissimus dorsi—the large muscle on the side of your chest and back that helps you pull and climb.
Shortened slang from the anatomical term 'latissimus dorsi,' which is Latin meaning 'broadest of the back.' Popularized in fitness culture in the late 20th century.
The lats are one of the largest muscles in your body, and they're why rock climbers and swimmers develop those distinctive 'V-shaped' backs—the lats literally pull your arms down and back with incredible power.
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