It is a circular track of varying reducing sizes with changeable incline. It uses the centrifugal force to allow the runner to maintain the speed and stance of natural way of running even if running in a small space. It can be used by more than one person (the smallest model can accommodate 6 runners at the same time). It simulates a hiking trail with an increasing sense of gravity, therefore it will create a potential muscular development with the allows the individual to develop at the maximum the body mechanic power during the races in running stance. It is recommended for professional runners but it can also be easily used by those who like to run and want to keep fit. It has been found that the track circular design attracts children introducing them to a new form of play and exercise during the formative years. It improves flexibility, reaction time, muscular strenght and coordination (not using weights during the child formative years of development) useful as well as for adults physical maintenance and weight less. It can be placed either indoor o outdoor forum, if located inside a gym can represent a decorative element. KINEMATIC AND DYNAMIC ANALYSIS OF RUNNING UNDER CONDITIONS OF VARIABLE GRAVITY V. Crupi, G. La Rosa A new training system was designed and realised by the engineer G. Scuderi: a centrifugal track for runners. The principal advantage of this track is to increase the forces on athlete during the run with an effect very similar to that of an "artificial gravity", so the athlete can develop more muscle power. A multibody numerical model of a runner was developed to analyse the behaviour of the athlete on the centrifugal track. The multibody model was calibrated by experimental analysis; in fact, the joint angles were measured by a digital image processing system and introduced as input in the numerical simulation. The numerical results obtained are the values of many kinematic and dynamic variables, in particular the ground reaction force and the moments in the hip, knee, and ankle joints. A comparison between the normal running and that on the centrifugal track was carried out, demonstrating the validity of training on the latter. The results of the numerical simulation confirm that the power developed during running on the track, and the corresponding work performed by the joints, is considerably greater than that found during normal running.