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One school of thought insists that if you place enough stress on a given muscle, the muscle will develop maximum symmetry. This concept is erroneous as my findings have shown me. If it were true, we would need no diversified equipment such as the Preacher Bench for low biceps and Brachialis Anticus development or bent over barbell curls for high peak bicep and Coraco Brachialis development for instance. Nor would we need incline barbell and dumbbell work for high pecs or parallel dips and or decline bench work with weights or pulleys for the low pec.
- VINCE GIRONDA
You're Not Going To Believe This, But...
Although it's rarely addressed, the standard curl doesn't directly affect the bicep -- at least that's the case with some people. It all comes down to your anatomical make-up. For an unlucky bunch, the main contributor is the brachialis muscle, which runs underneath the outer part of the bicep. That's the muscle most responsible for drawing the hand toward the shoulder. Naturally, as the resistance is increased, the muscle fibers of the bicep come into play, which is why heavy curling will increase bicep size. Simple, right? Maybe not. Since everyone's point of insertion is different, for some, the brachialis may absorb the majority of stress, thus, the biceps function becomes limited. In other words, the biceps will only receive as much stress as the brachialis will allow.
More Weight = More Growth. But Where?
The obvious solution of increasing the stress on the biceps would be to simply increase the weight, but as many of you may have realized, that tactic doesn't always work. Have you ever used an extremely heavy weight for curls only to wind up with sore forearms the following day? That's because the additional stress was, once again, handled by the brachialis. They're a very efficient muscle. Unfortunately, by being so efficient, they rob the biceps of additional growth stimulation. You may be able to lift more and more weight, but the biceps remain the same size. Very frustrating.
A New Angle On Things:
If you're an advanced bodybuilder, you may have tried a series of angles in order to better isolate the bi's. This is a necessary part of anyone's training. We all need to discover how to hit a muscle with the optimum force and in the case of the biceps that won't budge, the key is to try and eliminate the brachialis as much as possible.
- BODYBUILDING TRUTH