Use momentum too often? Plant your back against the wall when you curl. “This will help isolate your biceps, but it’s also important to keep your core fully engaged,” suggests Friedman.
Do It: Back-Against-The-Wall Dumbbell Alternating Biceps Curls
Put your back against a wall (or put a Swiss ball between your back and the wall), bend your knees slightly, and keep your elbows in contact with the wall (or ball) as you execute reps.
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