What causes some people to have huge biceps but tiny triceps while others have big triceps and small biceps?
The answer to this question lies in genetics, specifically in the insertion point of the brachialis muscle. The brachialis is the muscle responsible for flexing the elbow joint, and its insertion point determines how much it contributes to the appearance of the biceps.
In people with large biceps and small triceps, the brachialis inserts high on the radius bone, near the elbow joint. This causes the biceps to bulge more when flexed, making them appear larger. Conversely, in people with large triceps and small biceps, the brachialis inserts lower on the radius bone, closer to the wrist joint. This causes the triceps to be more visible when flexed, making them appear larger.
While genetics play a major role in determining the relative size of the biceps and triceps, training can also affect their appearance. Exercises that target the brachialis, such as preacher curls, can help build the biceps, while exercises that target the triceps, such as tricep extensions, can help build the triceps.
Related Questions:
- Why do some people have bigger arms than others?
- What muscles make up the biceps and triceps?
- How can I build my biceps?
- How can I build my triceps?
- Can I train my biceps and triceps on the same day?
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