1. A low profile, passive exercise garment comprising: a first attachment structure, for attachment with respect to a first region of a body; a second attachment structure, for attachment with respect to a second region of a body which is movable throughout an angular range with respect to the first region; a resistance element between the first and second attachment structures; wherein the resistance element imparts bidirectional resistance in response to movement between the first and second regions of a body, throughout a range of motion, but imparts no directional bias in the absence of motion between the first and second regions of the body.