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The effects of two training programs on movement discrimination ability, at the ankle and knee, were assessed from the left and right lower limbs of forty-four football players. All players in three Under 18 Victorian Football League (VFL) squads were allocated to either wobble board training, jump landing training, or no-training conditions. Pre-tests to assess discrimination of extent for active movements made while standing were carried out on both ankles and knees of all subjects, using an automated device to accurately set the different movement stop points. Five distances were used, between 10.5° and 14.5° from horizontal for ankle inversion, and between 30.3° and 31.7° from vertical for knee flexion. From a series of 50 inversion movements and 50 knee flexion movements, matrics of absolute judgement by actual movement extent were produced. Non-parametric signal detection analysis was applied to the …