An upper body exercise where you hang from a bar and pull your body up until your chin clears the bar, then lower yourself back down. It primarily targets the back muscles and biceps.
From 'pull' (to draw toward oneself) + 'up' (upward direction). The exercise has ancient origins in military training and gymnastics, formalized as a fitness test in the early 20th century.
Pull-ups are one of the best indicators of relative strength - they require you to lift your entire body weight! Many elite athletes consider the ability to do 20+ pull-ups a benchmark of serious upper body conditioning.
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