Most biceps exercises, such as barbell and dumbell curls, require that you move the resistance around your body while your body remains anchored. While this is certainly effective, it has been established that exercises which require you to move your body around a fixed object (such as occurs during a chin-up) fire many more muscle fibers. This results in a much more effective exercise for the muscle! And if that wasn’t enough to make this a killer exercise, have a look at this:
The majority of biceps exercises are isolation exercises. They work the biceps across only one joint (the elbow). This seriously limits the amount of weight you can use and hence limits your ultimate biceps development.”

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