Applied Kinesiology (AK), a non-invasive diagnostic and therapeutic system developed in 1964 by Dr. George Goodheart. AK utilizes manual muscle testing to assess various bodily imbalances, including structural, nutritional, and neurological issues. Practitioners, often chiropractors or osteopaths, gently apply pressure to a patient's limb to evaluate the nervous system's response to stimuli, with a weakened muscle indicating an underlying problem. Over time, AK has expanded beyond its initial scope to incorporate elements from other healing arts, such as acupuncture and cranial techniques, aiming to provide individualized treatment. The International College of Applied Kinesiology (ICAK) emphasizes AK as the "original system" for its replicable diagnostic and treatment procedures.