The most logical variables are probably stance and how good you warmup
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Drag. This is the force which acts against a runner and is the resultant force of the runner pushing against the particles in the air. Drag is affected by the mass and surface area of the runner. Friction is another force which can affect running.
Running height has no known affect on speed. Running economy is the most important factor. The more efficient a runner is with stride rate or turnover the faster the runner will be. Heart rate training also plays a big role in speed and efficiency. http://www.givenbrand.com/timex.html has inofrmation on what role heart rate plays on speed and endurance.
There is not currently a 'Maze Runner' movie
There are no elderly in the Maze Runner.
The Road Runner's gender is ambiguous ; the creators and writers never alluded to the Road Runner's gender .