An action analysis method comprising: an image recording step for continuously photographing a target; a movement locus measuring step for obtaining a movement locus of the target; an action analysis step for analyzing an action of the target from the movement locus; and an output step. A geometric model for each personalization item is constructed. The first assembly and the second assembly are configured to be positioned such that a distance between the remote centers of motion of the first assembly and the second assembly is no greater than two centimeters.