Lie face down on a flat rack or bench with a dumbbell in each hand using a wide grip (hands wider than shoulders). Let your arms hang down toward the floor. Keeping your chest supported and core engaged, pull the dumbbells up toward your sides with elbows flared slightly outward. Squeeze your shoulder blades together at the top, then slowly lower the weights back to the starting position under control.
Log your dumbbell lying wide grip row on rack sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.