Imagine for a moment that some clever chemist has developed a serum with the power to equalize running fitness among all who ingest it. Just swallow two drops and instantly you have exactly the same amount of running fitness as everyone who has done the same. Now, let’s say that you and ninety-nine other runners who have sampled the serum compete in a 10K race. What will happen? Will all of you tie for first place? Not a chance. The reason is that fitness is not the only factor that determines running performance. A separate factor is running skill.
