Differences between high and low perceived physical self-concept and actual motor performance of 120 fifth grade boys were investigated. Self-concept was measured by the Physical Self-Concept Scale. Motor proficiency was measured by a four-item advanced agility/coordination test battery: hand-eye coordination; foot-eye coordination; whole body agility/coordination without running; and whole body agility/coordination with running. Results indicated that there was a difference between the upper and lower third groups on perceived self-concept and actual motor performance. The upper group (high perceived physical self-concept) was high on actual motor performance. The separate motor performance tasks of the whole body agility/coordination with and without running were assessed as the best predictors for actual motor performance. Subjects exhibited a stable self-concept which accurately predicted their actual motor performance. (JD)