The relationship between the M response and one of its basic theoretical components, overt motor activity, measured by participation in varsity level sports and related activities, was determined. 114 Ss were assigned to a participant group and 108 Ss to a non-participant group. The Group Rorschach, the Group Form of Coan's Individual Movement Cards, and the Guilford-Zimmerman Temperament Survey were administered. The results failed to confirm Rorschach's theory that overt motor activity inhibits kinesthetic perception. Flexor movement was significantly associated with non-participation. The participant group scored significantly higher in Factors G (General Activity), A (Ascendance), S (Sociability), and E (Emotional Stability) of the Guilford-Zimmerman Temperament Survey. Intellectual functioning appeared as the most important factor in M production.