Here are a few worksheets for non-participants to complete. I have used them a number of times now to good effect. I have had pupils fill them in during the lesson and then had them feedback or ask questions to the pupils taking part as a plenary exercise.
Four swimming resource cards covering each stroke. They can be used as coaching aids for non-participants or for teaching point reminders for pupils. Each card describes the arm action, leg action, body position and timing for each swimming stroke.