Muscles and Meridians presents a pioneering exploration of human movement, rooted in evolutionary and developmental biology. It introduces the innovative Contractile Field (CF) model, offering a holistic approach to understanding and treating musculoskeletal disorders. The CF model suggests that sense organs are integral to contractile fields, and that the musculature of the viscera and the kidneys' role should be considered. It defines these fields, identifies their borders, and explores their interactions. The model also proposes a new assessment Archetypal Postures, which can help understand and alleviate many musculoskeletal aches and pains. Furthermore, the CF model correlates with the Chinese meridian map, providing a new perspective on this ancient, yet misunderstood, system.