(eng): The purpose of this paper is to present a preliminary design and kinematic analysis of a simple mechanical device, called the trainer. This experimental device is designed for future use in a mechatronic system being the five-link laboratory walking-like system. The experiments on the trainer planned for the near future, aim to validate the recently developed controller implementation in the real underactuated walking robot model. Yet, the preliminary results demonstrate the suitability of the proposed trainer device.