When doing both pulldowns and chin-ups, it's important to puff out the chest and lean slightly back.
The lats cannot fire efficiently when the chest and lower back are flat/vertical, i.e. straight up and down, the way most people do pulldowns and chins.
This results in the biceps getting more work. Leaning back and puffing the chest out to meet the bar as you do the exercise forces the arch into your lower back and dramatically increases lat activation.
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