The alternating batwing row is great for In general back strength. It targets different back muscles simultaneously. I like to recommend making use of an incline bench, alternating rows with dumbbells in each hand. The traditional spinal erector exercises are deadlifts and front squats. You can do dumbbell Romanian deadlifts, https://hammerstrengthdumbbells12111.blogvivi.com/33919233/considerations-to-know-about-back-exercises-with-dumbbells