Abstract: In one aspect, the present invention is directed to a kit for constructing a biomechanical model of a lever system selected from a first class lever system, a second class lever system, and a third class lever system, comprising a base, a support structure attachable to the base, at least one lever assembly attachable to the support structure, and at least one cord assembly attachable to the lever assembly. The present invention is also directed to first, second and third class lever system models useful for teaching and demonstration purposes.