Genetics is how a muscle anchors etc. On some people the bicep anchors close to the elbow and others it might anchor farther from the elbow. In my case the Biceps anchor (distal end) about 2 fingers above the elbow. The result of this genetic anchor is a lack of natural peak to the biceps when flexed. By using isolation exercises for the outer head, I have been able to increase the peak. Muscles change shape all the time. When we do not exercise the fibers lay flat giving the muscle a flat appearance, when we exercise and fill the muscle they take on a round shape.

The biceps being two muscles laying side by side, if we build up one side ( long head ) more than the other side (short head) then the muscle changes shape (biceps bacillus).


When we build up a small area of a muscle or hit it from a different angle I believe it changes the shape of the muscle. I would suppose it depends on how we define shape