Lore of running

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The point is people didn't need to "drop out" because they weren't getting hurt. You have no evidence for this statement. The Lore of Running is a good reference if you're a runner I suggest getting it. One of the things the author deals with was the introduction of running shoes to the existing athletes at the time. It did make much difference and for some it caused problems. But there are now athletes who couldn't compete without them. As an example how would you deal with flat-feet historically? Looking at how armies have handled it just excludes you from fighting.