CUT THE ROOTS
We split the class in two. Half the class are the plants with the root (skipping ropes) in their back of their pants. The other half are the gardeners who try to pull the roots out of the plants. When a gardener gets a root turns into plant. The plant who losses its root turns into a gardener.
Basic rules.
Roots can be only pulled out by using the hands.
Gardeners can´t pull out the root of a plant when they´re still putting it on.