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Executing a Barbell Biceps Curl is pretty simple, but by taking one foot off the ground and performing a Single Leg Barbell Biceps Curl, your whole body will be working.
Since you're on one foot, the leg on the ground has to work very hard to keep you balanced while your biceps execute the curl. Your butt will be isometrically contracting (holding you still and flexed) and your core musculature (abdomen, back) will also be holding you steady. Standing on one leg and doing this exercise will help you work your whole body, helping you see gains not just in your arms.
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