I agree that paring a shy student, or one who is reluctant to participate with an more outgoing student does usually work. I will also try to utilize that student in a way that they are either keeping score in a game, assisting me with preparation or observation of the activity. We often put photos of activities on our school's Facebook page, so allowing a student to take pictures to post exposes them to the activity and the learning f the content without increasing what they may percieve as "risky" activity.
