Run four steps forward and notice that you drop your feet behind to speed up and reach a level pace. Running cannot be done another way so it is the first irrefutable and observable science in health, fitness and sports. You can now let gravity do all the work of moving you forward to walk, jog, run and sprint. A sprinter goes through all four speed labels to reach top speed. The four speed labels are the same self transport movement at a variety of speeds. Walking can be seen as running slowly and sprinting can be seen as running very fast. See more at http://www.runningtechnique.net/ all content nothing to buy.