rednose1 said:
Some people have just very odd beliefs that they hold true, no matter what. I knew a guy that would argue against anyone that black people could run faster because they had an extra leg muscle.
That's actually true. During the slave trade, people with less abbility to build muscle began to die, as did people that had trouble retaining water and salt. This meant that almost all black people that survived the slave trade were considerably stronger than the average white man, thus, their genes lived on.
There are other possible contributing factors, all linked to the part of the world that black people originated from, but your friend was actually correct.