In pairs with one ball, both players face each other in the squat position.
The players then have to push the ball at head height with two hands. Heels should not stay in contact with the floor.
On the coach's signal the players should start to push harder and jump in squat position with the aim of making their opponent lose balance.
The one to stay balanced three times wins
If you want players to work more with their whole bodies excluding arms, tell your players to straighten their elbows and keep them straight during the exercise.
"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.