To improve the the system, make mobile parts immobile or vice versa.

 

Illustration:

A correct race chart and an understanding of when to run at a moderate or fast pace are some of the secrets of runners' victories, particularly of medium- and long-distance runners. The race chart is perfected during years of training, during which the coach never ceases clicking his stopwatch.

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A more efficient method of training is to have the athlete run on the moving track of a treadmill while the coach varies the track speed, thus controlling the pace of the athlete.