http://AskTheTrainer.com/best-back-exercise.html
Personal Trainer Michael Behnken, MS, NASM-CPT-PES, CSCS
There are many ways to perform dumbbell rows.
The most functional way is to have a wide base leg. If you are rowing with your right arm, your left knee would be on the bench, and your right leg should be out about a foot to a foot and a half.
Always keep the base leg slightly bent, this ensures you will not compensate solely with your lower back.
You can have a slight torso rotation while you lift the dumbbell. This is functional like many pulling activities.
You can also perform the dumbbell row as a strict isolation exercise. You could also perform without the bench.
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