FILE - Central and Mirror Lake Middle School cross-country runners, wearing pink for breast cancer awareness, climb the final hill of a cross-country race at Kincaid Park in Anchorage, Alaska on Tuesday, Oct. 1, 2013. According to the Centers for Disease Control and Prevention, only 1 in 4 U.S. kids aged 12 to 15 meet the recommendations of an hour or more of moderate to vigorous activity every day. The CDC released partial results Wednesday, Jan. 8, 2014 from a fitness survey, which involved kids aged 3 to 15. (AP Photo/Dan Joling)