of the back and, more precisely, of the great dorsal. "Lat", in English, is the vulgar term used to indicate the latissimus dorsi.
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Together with the pulley or various types of row machines (for example High Row and Low Row) the lat machine is considered one of the essential machines for back training - to which the basic barbel row and dumbbell row exercises are added ( also called bent-over), in all their variants (one or two arms, T-Bar etc.) Even the deadh lift (deadlift) is able to recruit the grand dorsal.
Generally speaking, it could be said that the vertical wide-grip pull-ups are used to train the grand dorsal (back width) while the horizontal narrow-grip pull-ups are used to stimulate the great round more (thickness of the back).