One player throws the ball to the other player's head.
The throw should be slightly in front of the heading player so that they need to meet the ball in the air.
The returning header should also be slightly long, meaning the catching player needs to back track slightly in order to catch the ball.
"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.