Dumbbell rows are a great exercise to target your back. Many people complain that they usually feel these in their arms, shoulders, and traps instead. They can be a little tricky at first but once you get the form down, you’ll feel a big difference.
You should grab the dumbbell but let your arm hang a bit and focus on retracting your scapula before trying to just grip it and rip it towards you. Otherwise, you will use mostly arms, traps and rear delts instead of your back. Further, do not hyperextend your neck but keep it neutral. Make sure your lower back is tight and then row the dumbbell more towards your hip/rib area instead of straight up. Going straight up towards your chest will engage more of your traps and shoulders and less of your lats. You can do these leaning on a bench or leaning on the dumbbell rack...whichever is more comfortable for you.