imagine in your mind a time when you ran really fast. see what you saw and how you felt and even the smells and sounds you heard. practice doing this until you have a perfect image and sense of running as fast as you can. now, as you see yourself running hard notice the images at the sides of your vision. you will see trees and fences and other people possibly, and even the ground beneath your feet. these images are what give you the sensation of speed.......a frame of reference.........so that you know that you are moving. otherwise you would be moving your arms and legs and breathing hard but your eyes would say that you are standing still, in your mind, during this exercise.
o.k. so here comes the next step.
while you are experiencing this in vivid detail really focus on the things moving out of the corners of your vision. install fence posts if you need to, and as you reach top speed and reach for that extra bit of effort to go just a little bit faster suddenly make the fence posts double in speed out of the corner of your vision and make a whizzing noise in your mind and feel yourself propelled with the added imagery.
did you experience anything different physiologically as a result?
do the exercise over again and take the time to build the model up in your mind, visually, auditorily and kinaesthetically (feelings) and really notice the feedback as you add the new bits of the experience.
you will know when you get it right because your bodily sesations will take on more sensations of physical speed as a result.
and the next time you run your body will remember how to run faster as a result.