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One arm rowing is one of the finest mid- to upper-back exercises. Secondarily, it works your biceps and forearms and, to some degree, your abs and lower back because you must stay tight to row properly.
Watch the video a couple of times (daughter Jennifer demonstrates). Then take a solid stance, resting one hand on a sturdy bench. With your opposite arm extended, pull the dumbbell toward your hip. Lift and descend smoothly. Exhale as you pull. Inhale as you extend.
No hunching over. Keep a nice normally flat back.
If you are super-setting opposing muscle groups, the one arm row works perfectly by alternating sets with chest press exercises.