Raw food expert Viktoras Kulvinskas shows how to use muscle testing or applied kinesiology to find out what is good for you. You can use this technique to test supplements, food, ideas, relationships etc. I've personally used it for over 30 years and it always works. Start to experiment and find your own answers.
I am new to this site, so I don't want to be seen to advertise, but I saw a press release for a handheld muscle tester called the Touchstone that might be of value to some people wanting to experiment with muscle testing..