Increasing physical activity of children during school recess.

The team worked with elementary students during recess. They used a self-management package: kids picked step goals, wore pedometers, counted steps, and earned small prizes for meeting goals.

Adults gave quick feedback after each recess. The study used a multiple-baseline design across students to show the package, not chance, caused change.

Step counts rose 47%. Time in moderate-to-vigorous activity jumped from 4% to 25% of recess. Gains stayed high while the package stayed in place.

Annable et al. (1979) found the same self-monitoring plus feedback cut home electricity use 7%. Same parts, new behavior—proof the package travels.

Emmelkamp et al. (1986) used the same design with kids and parents. Flossing gains held for months with rewards and feedback, just like recess steps.

Kendrick et al. (1981) cut bus noise with a group contingency, not self-management. Both studies fix school problems, but different tools for different targets.

You can run this recess package tomorrow. Hand each child a pedometer, a goal card, and a sticker. Five minutes of adult feedback beats hours of lectures on health. No extra staff, no special room—just recess made useful.