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The single-arm dumbbell row is a great exercise for toning the largest muscle of the upper back, the latissimus dorsi, known as the "lat." It's also one of the most common moves that people perform incorrectly by using their biceps instead of their back muscles to do the work. In case you're making this mistake, watch the video above for a quick exercise tutorial from Geralyn Coopersmith, director of the Equinox Fitness Institute.

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