The one arm dumbbell row is a great exercise for both isolation and mass. You can use a very heavy weight with this exercise which really focuses on building the lats and middle back. Start this exercise by positioning yourself parallel to a flat bench. Place one knee on the bench and grab the dumbbell with the hand furthest away from the bench. Use the other hand for the necessary support on the bench. Arch you back and lift the dumbbell slowly all the way up until your back reaches a full muscle contraction. Your arm should then be flexed and in the upright position close to your side and against your chest. Try and hold the dumbbell at the top of the movement for one count for a peak contraction. Lower the weight slowly and under control so the muscle is working to its fullest capacity on the way down. Repeat for 8 - 12 reps and 3 - 4 sets. To complete the set switch the weight to your other arm and remember to also change the side of the bench you are on as well as the knee on the bench.
Consider using a strap or grip for the dumbbell as your forearms most likely will fatigue more quickly than your back. If done properly you will really notice an improvement in your lat sweep as well as more carved out detail in your middle back.
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