The HHS(US Department of Health and Human Services) has just come out with new guidelines for physical activity, and it now includes a statement for preschool children
Preschool-aged children (ages 3 through 5 years) should be encouraged to move and engage in active play as well as in structured activities, such as throwing games and bicycle or tricycle riding. To strengthen bones, young children should do activities that involve hopping, skipping, jumping, and tumbling. Although the specifc amount of activity needed to improve bone health and avoid excess fat in young children is not well defned, a reasonable target may be 3 hours per day of activity of all intensities: light, moderate, or vigorous intensity.
Special Considerations for Children and Adolescents With Disabilities
Children and adolescents with disabilities are more likely to be inactive than those without disabilities. Youth with disabilities should work with a health care professional or physical activity specialist to understand the types and amounts of physical activity appropriate for them. When possible, children and adolescents with disabilities should meet the key guidelines. When young people are not able to participate in the appropriate types or amounts of physical activities needed to meet the key guidelines, they should be as active as possible and avoid being inactive.