the study tested the effects of video replays enhanced with graphic, kinematic feedback on a targeted aspect of the hockey skating stride. a single subject, multiple baseline, across participants design was used. participants were 4 varsity hockey players. feedback was a measurement of the supporting knee angle at extension of the thrusting leg and a visual representation of an optimal angle, superimposed over video replay. feedback immediately followed alternate trials, during several sessions over 5 weeks. the targeted change was a lower angle of initial knee flexion. mean and level of initial knee flexion reduced after intervention in all participants. changes were observed to occur at the second session of the intervention phase.