Applied kinesiology (not to be confused with the scientific study of human movement) is major chiropractic-based woo based on the idea that the way your muscles respond to being pushed against can tell the "doctor" what you're suffering from. Apparently the practice can also be used to turn your body into a human lie detector. The things these people believe...
The applied kinesiology scam is a trick used by some chiropractors and purveyors of "power bracelets" to fool someone concerning the efficacy of an object or therapy. It entails placing someone in an unstable position or touching them in a way designed to momentarily distract them then pushing or pulling on them to make them unbalanced. The procedure is then repeated but with the aid of the 'magic' item, however, this time the subject is sub-consciously prepared for the action and is able to successfully resist the pushing or pulling.
A Skeptic Zone Podcast shows how it is done