Most athletes do not complain about the short beam
Both heads of bicep muscles are attached to the elbow joint using a tendon, and thus any movement of flexion, each works beam. Also banal curls, biceps is responsible for turning the palms outwards - towards the thumb. This process is called supination, and it is possible due to the lateral muscle attachment. As a rule, most athletes do not complain about the short beam, but with long many have problems. http://musclemaximizerprgrm.tumblr.com/post/86186935814/what-causes-muscle-soreness
The fact is that the anatomical structure of the outer (long) biceps does not allow her to actively participate in the standard curls. However, if you will take your elbows back, external beam stretch and can actively participate in the work. http://musclemaximizerprgrm.blogspot.com/2014/05/what-causes-muscle-soreness.html
There are several rules of varying load on the long and short beam - The farther your elbows behind your back, the more work will have a long head; - Derived forward bend elbows make an effort purely gentle hand beam biceps. A striking example is the bench Scott; - Narrow grip helps to transfer the load to the outer head, but it is not convenient for such a position is unnatural, so that you inevitably begin to deduce the elbows forward, and it will make short work already beam; - Wide grip as you may have guessed includes work in the short head of the biceps mainly.
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