One person is lying on the floor. Two other people walk up.
First-person: "Hey, this guy is hurt." he goes and checks his heartbeat.
First-person: "No heartbeat. Help me do CPR"
The second person goes down and starts pumping on the chest, and the first guy does the mouth blows.
Do this for a little while.
Second person: "I'm getting kind of tired here. I think it is time to switch."
First-person: "OK, ready."
At this point, the person on the ground gets up, one of the other people goes down, and they start doing CPR again.
There you go. This is a good skit to do with leaders.