TWIN FALLS, Idaho (KLIX)- Magic Valley Third graders seem to be at a healthy weight. That’s according to a new survey done by the South Central  Public Health District conducted in 2011 and 2012. The Body Mass Index Assessment uses a child’s height and weight to determine the body fat. The health district measured 364 third grade students in six counties at six schools selected randomly. Health Education Specialist Susie Beem says overall the findings in the survey are good. 66% of children were at their ideal weight, 32% were overweight or obese and 2% were underweight. The health district will use the data to help combat childhood obesity with local school districts.