[1] Department of Health and Human Services, Physical Activity Guidelines, page 14. Available for download here: https://health.gov/paguidelines/default.aspx
[2] Department of Health and Human Services, Physical Activity Guidelines, page 14. Available for download here: https://health.gov/paguidelines/default.aspx
[3] Department of Health and Human Services, Physical Activity Guidelines, page 14. Available for download here: https://health.gov/paguidelines/default.aspx