Again, as for actually time/performance gain, I don't think I can be persuaded that big-big vs. small-small amounts to anything measurable absent the athlete. But the athlete's body is extremely sensitive to small changes, and these small changes can make a performance difference.
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Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter