There's a really interesting video of Martin Schoeller shooting a female bodybuilder on youtube. She can't even actually see him because of the huge bank of lights that he is behind but he still maintains a beautiful rapport whilst rattling off 10x8's like a machine.
I think that jp498's suggestion to let the subjects look through the ground glass is a good one. Most people have simply never had the opportunity to do this and are typically very impressed.
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