Pair up in groups of two and stand back to back. Make sure participants introduce themselves to one another.
Then the leader will say different combinations that the group has to try to get to while staying back to back (right hand to right hand, left foot to right foot, head to head, right hand to left leg, etcÛ_). The pairs must maintain all called combination until they switch partners.
Once the leader says People to People they will then go switch partners.
If you have an odd number of participants, the odd person is the leader. Once pairs switch, the odd person out is the new leader.