One of the biggest mistakes lifters make is to start the movement by launching the bar or dumbbell with momentum. Creating momentum at the waist causes the lifter to lean back, moving the tension from the biceps to other muscle groups. Lifters often cheat at biceps exercises when it gets most difficult, usually at the 90-degree angle. However, working through that sticking point will truly enhance overall improvement in the biceps. The desire to cheat by launching the weight with momentum is natural, but the best results will come if you force yourself to work harder when it gets harder

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