The arms are swinging out wide in the backwards phase of the arm drive this wayward arm action upsets the rhythm of the upper body and causes the head to rotate
"It is not only useful for staff who are experienced but a valuable tool for those subject staff who have to take teams."
The variety of sessions across sports - sometimes we steal session ideas from one sport and use them with another.
As we enter the business end of the competition, we take a look at the remaining eight teams and the key talking points surrounding each side.