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While biceps curls aren't an unsafe or "bad" exercise, I'd rather do a three-for-one toning move that strengthens your shoulders, core, and arms at once, says Andrea Metcalf, certified personal trainer and author of Naked Fitness.
To do plank rows (pictured), begin in plank position, dumbbell under right hand. Brace abs in tight, and row the weight up to the side of ribcage, bending right elbow in by side. Do one full set (10 to 12 reps) and then switch sides, or alternate arms for each row (just be sure to do equal reps on both sides).
Don't waste your time (or risk injury) with these moves the pros won't touch
female doing crunch on medicine ball