Sit at a lat pull-down machine with one hand gripping the handle in an underhand grip.
Pull the handle down to your upper chest.
Slowly return to the starting position. Repeat with the other hand.
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About this exercise : Single-arm lat pull-downs with an underhand grip, targeting the lats and biceps. This variation is great for building back thickness and improving arm strength. The underhand grip provides a different angle of resistance.