From Cubscoutpack.com

Setting: First person is lying on the ground on his back and appears to be unconscious. Second person and third person walk up and notice the unconscious person.

Second: Oh no, he looks unconscious. We better start CPR.

Second and third kneel beside the first person. Second person starts chest pumps while third person counts.

Continue this for about 15 - 30 seconds.

Second: I'm starting to get tired. Let's switch positions.

First person sits up and prepares to do chest pumps. Third person lies down and becomes the unconscious person. Second person starts counting.