Muscle Group: Back
This exercise works each side of the upper back independently. Using dumbbells forces each side of the body to work up to its own capacity, rather than running the risk of having the stronger side assist out the weaker one.
Hold a dumbbell in each hand, bend your knees slightly, then bend forward from the waist, or you can sit at the end of a bench or char. Keeping your head up and your back straight. Have the weights hang at arm’s length below the shoulders.
Concurrently lift both weights up as far as possible to your sides, keeping your upper body still so you do not involve your lower back (the weights should come up to your sides, not your chest, in order to keep biceps involvement to a minimum).
Then lower the weights again, slowly and repeat.