OSNAP Training Materials

Harvard Prevention Research Center on Nutrition & Physical Activity

Young boy eating a green apple

A Prevention Research Center Tool Showing Evidence of Effectiveness


The Out of School Nutrition and Physical Activity Initiative (OSNAP) aims to improve wellness practices and policies in after-school and similar programs. The Harvard School of Public Health PRC developed this tool with input from after-school providers and tested it in programs for children aged 5–12 years. OSNAP seeks to fulfill the following goals:

  • Improve nutrition.
  • Increase physical activity time and quality.
  • Limit recreational digital screen time.

The OSNAP guide outlines the program standards and provides a change model including the following seven steps for staff:

  • Analyze current after-school policies and practices.
  • Learn through collaborative meetings.
  • Identify goals for improvement.
  • Implement action steps.
  • Communicate well with stakeholders.
  • Track progress.
  • Re-evaluate and celebrate improvements.

The guide includes links to assessment and action planning forms, documents for setting up a learning collaborative, a policy writing guide, nutrition and physical activities information, and staffing resources. An associated train-the-trainer presentation prepares leaders of OSNAP learning communities.


Under the OSNAP program, children drank more water,1 and their exercise time was more vigorous.2 The guide has helped staff write health-promoting policy statements about nutrition, physical activity, and screen time in 20 after-school programs.3


Download the printable PDF version [PDF – 744 KB] of this web page.

  1. Lee RM, Okechukwu C, Emmons KM, Gortmaker SL. Impact of implementation factors on children’s water consumption in the Out-of-School Nutrition and Physical Activity group-randomized trial. New Dir Youth Dev. 2014;143:79–101.
  2. Cradock AL, Barrett JL, Giles CM, et al. Promoting physical activity with the Out of School Nutrition and Physical Activity (OSNAP) initiative: a cluster-randomized controlled trial. JAMA Pediatr. 2015;1–9.
  3. Kenney EL, Giles CM, deBlois ME, et al. Improving nutrition and physical activity policies in afterschool programs: results from a group-randomized controlled trial. Prev Med. 2014;66:159–166.