Tennis Drill Demonstration
Scatter some cones (divots) across the area, some the right way up, and some upside down. Split the group into two teams - 'Hackers and Greenkeepers' - and spread them out across the area.
On the word 'Go' the Hackers run round turning the divots upside down and the Greenkeepers must turn them the right way up.
After a set period of time, count the divots to see how many are the right way up and how many are upside down.
Change the teams round and start again.
Easier: Reduce the distance between the divots.
Harder: Increase the distance between the divots.