i.e are there some people with more tendons in their muscles than others, for instance.

You have different physical properties in your own body alone. Your left arm does not have the exact same composition as your right, for example.

Quote

The palmaris longus is a muscle visible as a small tendon located between the flexor carpi radialis and the flexor carpi ulnaris, although it is not always present. It is absent in about 14 percent of the population; this number can vary in African, Asian, and Native American populations, however.

Palmaris Longus muscle (forearm)

My answer is:

No, from ordinary social life point of view.   AND yes, there is difference from biology/physiology point of view.

The difference is just too too too tiny, and not necessary to discuss in our daily life.

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Edited November 24, 20232 yr by Phi for All
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13 hours ago, Daniel_J said:

The difference is just too too too tiny, and not necessary to discuss in our daily life.

Well so much for science forums, then.