1: They all have an effect on part of the race. For example and EFE affects the early pick up. Since the easy initial run goes to 20m, the speed at which the pick-up starts translates to the speed reached around 10m in the race itself, and this is where the improvement is reflected.
2: The exposure to WA is almost always helpful unless the athlete is tight, sore, or otherwise limited, in which case it might be wise to switch directions and go into the wind.
3:It is the height + breadth total that is the limiting factor determining the frequency of exposure and that is always individual with the timing being spread further apart as performance rises.
4: The incorporation of a neural pattern into a legal performance is determined by the acquisition of adequate power to carry out the same actions without illegal wind assistance and the timing of that acquisition is individual and becomes more lengthy as performance rises but is likely not less than 10 days for most people even at medium levels.