The average height is only increasing in the Western World and in the last couple hundred years as a direct result of diet Preme. Evolution supposedly occurs over tens of thousands or even hundreds of thousands of years there is simply no way for evolution to evolve better people in just a couple hundred years, I repeat better Olympic performance has absolutely nothing whatsoever to do with evolution and any scientist would agree with me, God has nothing to do with it, it's just evolution doesn't work that way.
Furthermore evolution doesn't mean that things improve and get better, it means that organisms adapt and change in response to enviromental factors so that the organism is best suited to its enviroment.
The best and fittest humans lived thousands of years ago. Neanderthal man was more muscular, had bigger brains ( bigger cranial capacity), better coordination and were physcially stronger than us. They needed to be because they lived in a very harsh enviroment.
In todays world each race is suited to their enviroment. Blacks are more muscular, have less bodyfat and more more stamina endurance than whites to cope with the harsher living conditions in Africa. These changes took thousands of years however which is why African Americans are still black after a few generations living in the US and why white generations of people stay white in South Africa for example, these changes take a long time.
In the Western world we are not evolving better physical bodies as we simply do not need them. Why in the world would an organism evolve and adapt in a way in which was completely opposite to the needs of its enviroment?
If there was a holocaust and man once again had to brave harsh enviroments, make long journeys for food, shelter and safety and lived in a physically harsh enviroment then humans would adapt accordingly. Whilst we live in an enviroment of plenty, where there are no predators, no physical demands upon our bodies like in times past then we simply will not evolve better and more physically stronger bodies.

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