Does the "running technique" of Seiho players exist in real life? In Episode 7, when they play against Seiho, it shows that the way the Seiho players run is different from the common way (specifically, the way they swing their arms). 

Does this running technique exist in real life?
I don't know this running technique, but I can tell you how important it is to swing your arms properly while running.

Have a Look here ->
LiveScience Arm Swinging.


  The scientists found that swinging the arms reduced energy costs by 3 percent compared with holding the hands behind the back, 9 percent compared with holding the arms across the chest, and 13 percent compared with holding the hands on top of the head.


If you have a look at professional runners, you will recognize how focused they move their arms. I can't tell if this special arm swinging is working, but there are surely different techniques to reduce your energy cost by swinging your arms.