A pacing system, e.g. for use in training athletes, comprises a series of light emitters 20 for positioning at intervals along a course which an athlete is to follow, e.g. a running track, and a preprogrammable control system 10 for energising the light emitters in sequence to simulate a predetermined pace for the athlete, the control system 10 being capable of effecting variations in the simulated pace over the length of the course. IMAGE
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