Stand with feet shoulder-width apart and grasp a Smith machine bar with a narrow, palms-up (supinated) grip. Hinge at the hips with a slight knee bend until your torso is nearly parallel to the floor. Pull the bar toward your lower ribcage while squeezing your shoulder blades, then lower it back down with control, keeping your back straight and core engaged throughout.
Log your smith bent over narrow supinated grip row sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.