As the trail leg is driving at the hurdle, the opposite arm goes back. And as the trail leg passes over the hurdle the opposite arm drives forward into the arm action required for sprinting.
"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.