Something Malcolm Gladwell once (it was in a pretty funny context because he compared it to DiCaprio dating supermodels
)said about Jamaican sprinting. Thought it was intresting. Dont think they're clean or anything 
Jamaica, a country one-tenth the size of Cuba, has now produced the world’s best sprinters for the past generation in numbers that defy all logic. Here, for example, are the results of the high school boys’ 100-meter finals from last year’s Jamaican Boys & Girls Athletics Championships:
Place Name School Time
1 Zharnel Hughes Kingston College 10.12R
2 Jevaughn Minzie Bog Walk High 10.16
3 Raheem Robinson Wolmer’s High 10.37
4 Martin Manley St. Jago High 10.38
5 Waseem Williams Jamaica College 10.40
6 Tyler Mason Jamaica College 10.48
7 Javoy Tucker Wolmer’s High 10.64
8 Odane Bernard Donald Quarrie High 10.75
“For those who are not track fans, I should point out that this final is probably faster than the ADULT national finals in virtually every country in the world except the United States. So why are the Jamaicans so good? There are many reasons, but the simplest is that the effect of peers on high performance is REALLY strong. In Jamaica, EVERYONE sprints. There are 20 heats in the 100-meter regional championships. And because everyone sprints, and the average quality of sprinting is so high, everyone’s expectations are raised accordingly. The psychological ceiling on elite performance if you are a high school sprinter in Kingston is, like, a foot higher than if you are a high school sprinter in America.”