Running is an essential movement not only in track and field events but also in all the other sports. Running speed is often an advantage in athletic competitions and running training is frequently conducted in various sports. Running speed is expressed as the product of stride and pitch (leg revolutions per time ) 1) . Therefore, in sports, training to increase the number of leg revolutions using ladders and other equipment, as well as training to expand the stride by stretching, jumping, etc., are used.However, the form during running is not always the same; even in short running, it has been reported that the acceleration phase at the start of running and full-speed phase afterwards are different 2) . At the beginning of running, the runner needs to accelerate, which mainly requires pitch movements to increase the number of leg