From the Guinness World Record Scout Challenges
The record is for the fastest time throw 10 different
tennis balls around a circle of people.
10 tennis balls
timer / stopwatch
Scouts stand in a 2m diameter circle, and must pass the 10 tennis balls in a pre-determined route across the circle - ball one from person 1 to person 2, 3 etc.
All the balls can be in play at once but each scout can only be holding one ball at once.
Full instructions are included on the Guinness World Record rule sheet attached