4 Introduction DOUBLE TAB TO ZOOM ON PHONE OR TABLET Although children love to move—and adults tend to think of them as constantly being in motion—children today are leading much more sedentary lives than did their predecessors. According to Nielsen research, “Younger children age 2–5 log close to 25 hours of TV time each week, more than 4.5 hours watching their favorite DVDs, about 1.5 hours viewing DVR offerings, more than an hour competing at video games and 45 minutes with the VCR” (McDonough 2009). In fact, watching television is the predominant sedentary behavior in children, second only to sleeping (Kaur et al. 2003). The advent of computers and video games has also contributed to the decline in activity. A study from the Kaiser Family Foundation determined that children ages eight to eighteen are spending more than seven and a half hours a day with elec- tronic devices (Lewin 2010)—the same number of hours some people spend at full-time jobs. According to Bar-Or et al., there is one consistent observation that stands out among the studies of energy expenditures in young children: children under the age of seven seem to expend about 20 to 30 percent less energy in physical activity than the level recommended by the World Health Orga- nization (1998). The Children’s Activity and Movement in Preschools Study (CHAMPS) determined that children enrolled in preschools were “engaged in moderate to vigorous physical activity (MVPA) during only 3.4 percent of the preschool day” (NIEER 2010). Pate et al. observed two thousand children and found that “children attending preschools were engaged in MVPA during COPYRIGHTED MATERIAL