Grip a pull-up bar with a narrow parallel (neutral) grip, palms facing each other. Hang with arms fully extended and core engaged. Pull your body up until your chin clears the bar, leading with your chest and keeping elbows close to your sides. Lower yourself down with control to full arm extension. Repeat for reps.
Log your chin ups (narrow parallel grip) sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.