Increasing physical activity among youth represents a national health goal, and using volunteer activity providers at schools offers one possible solution. This paper describes results from a program to recruit volunteer physical activity providers in middle schools. Twenty-one volunteers provided 850 physical activity hours at seven schools, including 575 activity sessions and 7,186 student contacts. Volunteers who received incentives offered more minutes of activity, conducted more activity sessions, reached a greater number of students, and logged more student-minutes of physical activity than those who received none. Male volunteers provided more activity minutes than female volunteers, but females were marginally more successful in engaging female students. Results can help guide schools to more effectively increase student physical activity throughout the school day.