It can be very useful for people to work in pairs throughout a course. These pairs can provide support and bring an extra dimension to reflection sessions.
You can stick to the same pairs for the whole course or you can vary the pairs if you want to determine the group's attitude to change:
Ask them to pair up with someone they don't know. See if they are adventurous in their choices. If they are not adventurous, ask them to chose another buddy for a later exercise. If this does not seem to have much effect, try asking how many people are sitting in the same seats as when they arrived you will be often be surprised to see more than 50 per cent of the group have not moved!