Is it Really the Case that One Arm is Larger than the Other? How to Tackle This Issue?
Sophia Williams
2026-03-15
7 min. read
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It is not uncommon for muscles to develop unevenly, and the size of the muscles on the right side of the body can differ from those on the left. For instance, the right half of the chest might have a different size than the left, one bicep might be larger than the other, and so on. Where do these disproportions originate from and how can one manage them? Answers to these questions can be found in this article.
One arm longer than the other – genetic conditions
I am reminded of the saying – genes are not an excuse... Referring to genes is one of the many excuses when we have difficulty shaping our physique... Of course, I don't want to question the influence of genetics on specific processes that occur during or after training... Everyone has, for example, a gene called the ACTN3 symbol that determines the ratio of individual muscle fibers. Depending on the information encoded in that gene, differences can occur, for instance, in sports results. Genes also determine muscle attachment sites, the number of muscle fibers, and other features that affect the process of shaping the physique... Symmetry affects the effectiveness of the movement system, yet shows minor disproportions... In my opinion, the differences in the general population are not significant enough to claim that genes are the main cause of significant disproportions between the sides of our body... In my opinion, the main causes lie in other aspects.
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