When you muscle test your subjects, you will want to give them their tested meridian balancing gemstone. Stock up now so you can. Each gemstone is on a small safety pin with the gemstone name, the meridian it balances and the URL to this site. Get five sets for a substantial discount.
The seven gemstones (and one piece of wood) that balance the Yin meridians and their related muscles. The gemstone that balances the Gaits here, too. These are all the gems needed for the related course: Balancing the Yin Meridians and Gaits with Gemstones.