Divide the class into two equal teams with the same number of Speed Stacks on each side of the play area. The play area is divided into two areas. Half of the team on each side will be designated the builders (people who up stack their cups) and the other group will be the runners (people who will take stacks from the other team's side). Once the runner gets a stack from the other side, he/she will give to the builders on his/her side to up stack. Switch roles after 45 seconds.