Moreover, teacher encourage children do more exercises and limited their media time. Studies suggested that children are more attentive and learn better after physical activity and movements. Physical activity is important to overall health and to overweight and obesity prevention. Studies have shown a relationship between TV viewing and overweight in young children. For example three to five years old who are watching two or three hours of TV per day are more likely to have obesity, so total media time should be limited to not more than thirty minutes once a week, and for educational or physical activity use only.