Of such generalisations are prejudices made?
Believing that black people have longer tendons or are more dense is never going to lead to prejudice unless you're seriously unbalanced.

No more so than believing they have higher genetic diversity than white people, anyway.

Generalisations are a good thing, they allow a better starting point for understanding things than having to start from 'new thing, what is it?'.

Also, assuming you're right (and you used bigger words than me, so could be), we're still lacking an explanation to why black people are notably absent from swimming events.
(Spidge New sig needed, donations gratefully accepted., Wed 7 Apr 2010, 15:01, Reply)