Stand facing a Smith machine bar set near knee height and grip it with an underhand (palms up) grip slightly wider than shoulder width. Hinge at your hips with a slight bend in the knees and keep your back neutral. Pull the bar toward your lower abdomen by driving your elbows back and squeezing your shoulder blades, then lower the bar with control while maintaining core engagement.
Log your smith reverse grip bent over row sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.