Dumbbell rows are an excellent exercise to strengthen the upper back and biceps. Since you do each side separately you get independent development of each arm and each side of your back.
Developing each side independently is important if you have one side that is much stronger than the other. It will help you stay in balance.
Dumbbell rows -- starting position
You should have your feet a little wider than shoulder width. The knees should be slightly bent. This will give you a very stable stance for the exercise.
Bend forward but keep the back straight. Stabilize yourself with one hand on a bench. Grip the dumbbell firmly in the other hand.
Dumbbell rows -- second position
Your upper arm should be parallel to your chest. Your elbow will be at about 90 degrees.
You'll feel the contraction in the lats along the side of the back and in your biceps muscle at the front of the arm.
Lowering the weight is the "eccentric" phase of lifting. Eccentric in this case means exercising a muscle while it is lengthening.
Don't just let the weight drop. A lot of the benefit of the exercise is gained during the eccentric phase.
Make sure that you lower the weight with good control. Feel the muscles working as you lower the weight.
This exercise can be done with a barbell as well. The barbell row is a more advanced exercise. In that exercise you don't have the advantage of a free hand on a bench for balance and support. There is also an increased risk of straining the lower back.
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