Applied Kinesiology or called Muscle Testing. Use your body's energy field to determine if a food, medicine, vita/herb, etc., is GOOD FOR YOUR OWN BODY. Know before you take something whether or not your body says it will help, be harmful, or is allergic. Remember, we are all different. What works for me maybe harmful to you. It’s easy to do. These links demonstrate the basics.
Applied Kinesiology Video - Part 1
Applied Kinesiology Video - Part 2
Strong arm resistance – arm stays straight, it’s good for you.