These profiles are matched with other profiles that are created by schools to become an official partnership. Once the partnership is created, Chefs Move to Schools provides schools and chefs with resources to help them get started and to help guide both parties through a successful process. Business involvement Private businesses have also decided to make changes to improve healthy habits for kids. For example, Disney now requires that all foods sold and advertised have to follow nutritional guidelines of increasing fruit and vegetable consumption while decreasing calorie count. Also, Walgreens, Superval, and Walmart have announced building or expanding stores in areas that have limited access to healthy foods. Physical activity The CDC recommends that children engage in one hour or more of physical activity every day. It states that children should do three different types of activity: aerobic activity, muscle strengthening, and bone strengthening. Let's Move! looks to promote physical activity through the support and cooperation of families, schools, and communities. On children, the initiative states, "Those who feel supported by friends and families or are surrounded by others interested in physical activity, are more likely to participate." Let's Move! also provides several guidelines for schools to promote physical activity, including strong physical education programs, and indicates the subsidizing of such guidelines with several government programs. Guidelines by which physical activity can be promoted in communities are also outlined on the Let's Move! website. Impact evaluation The Center for Disease Control publishes obesity rates broken down by age group. The report found that between 2009 and 2012, the obesity rate dropped by 3.7 percentage points among children aged 2–5, dropped by 0.3 points among those aged 6–11, and increased by 2.1 points among those aged 12–19. By 2015, childhood obesity rates had not changed much since 2008 but had dropped significantly among the youngest children; the exact impact that Let's Move! has had on these trends is uncertain. Collaboration Let's Move faces a challenge: effective coordination between all involved agencies, companies, non-profits, and levels of government. Dr. Susanna Campbell, an international relations scholar, and Michael Harnett, an international business professional, conducted research and discussed the barriers to coordination, the main concepts of coordination, and recommendations for improving coordination. Rodrigo Serrano also provides insight into creating incentive programs to promote coordination. Organizations are sovereign and the individuals within are accountable first to their organization and second to the coordination effort.