How to get clear YES/NO answers using a body pendulum

A few years back a gifted psychic and spiritual work or that I know taught me about the body pendulum. Budi pendulum work is really fun and it's really great when wanting a clear YES or NO answer to a question. It's kind of a simplified version of what you may ask in a tarot card reading. I like to use this as an icebreaker when I have my psychic parties, and it's always fun!