What are these 'ethnic groups'?
I'm seeing some Kenyans, some Algerians, some Moroccans, a Spaniard, a Burundian, a French guy, someone from Djibouti and a Somali born Brit.
What are the two ethnic groups? Maybe you could put them all into an even more nondescript category of 'brown' for us?
Why don't you explain why the three fastest Norwegians, Scandinavians even, are three brothers from the same family? Or why the Belgian 4x400 team is basically the three Borlee brothers?
Maybe there is something to be said about lack of participation in these European countries? No? Do you not think some of the top cyclists would make good runners? People prefer other sports or to go to university.