How to Fix Biceps Imbalance Fast! One bicep bigger than the other? The Bayesian Curl is one of my go to fixes on arm day. This unilateral cable curl, with your working arm behind the torso keeps the biceps under tension in a lengthened position. Benefits: • Hits the long head in a deep stretch — places unique tension on the portion of the biceps that often lags, helping shape and balance. • Constant cable tension through the range — better stimulus in the bottom/lengthened part of the curl than