I used to think that socio-economic and various other environmental reasons could explain why they excel at sprints ,but it cant . The reality is it simply comes down to hormones( the single most powerful substances in our bodies) . That collectively as group ( western african origin) have definite higher testosterone levels and quite higher growth hormone levels. Now I say collectively as a group because individually test. levels vary just as much as other groups. And similarly collectively in general whites have lower test. levels but individually varies just as high or low. This might bother some people, but not me as if my testosterone was not high enough all need to do is take some exogenous (made outside of body) amounts of it that enable me to train harder ,for longer with quicker recovery and eventually if train right lead to more gains in performance. If as a race are intelligent enough to make exogenous hormones ,then why not use them. I see no moral/health issues in using them and either do many black athletes and then go say they dont. well some people might say they are "not natural" and give one extra help but so do other training aids like synthetic track ,trainers , various equipment ,training and recovery methods are just as "not natural" either in helping to increase performance. The problem arises when certain training aids are not availeable to everyone then you are called a cheat. Personally i think alot of p.e.d's should be allowed to serious athletes AND as long as they are banned then i see the continuation of general disapperance of white sprinters. Again people might say they are bad for health and not safe ,but if well educated in how to use them properly the risk is same as taking aspirin or any risk in life in general . And no evidence that bad for health , infact the opposite if use them in correct way and the right moderation. I personally looking forward to the day ,if ever happens when media/society dont shone the use of p.e.d's anymore and if are an athlete in the spotlight dont have to lie or be seen to condem them .