Arpit, Misra. "Common Sports Injuries: Incident and Average Charges." U.S. Department of Health and Human Services - Office of the Assistant Secretary for Planning and Evaluation, 17 March 2014. https://aspe.hhs.gov/report/common-sports-injuries-incidence-and-average-charges. Accessed 19 October 2016.
On average people sit 4 hours more
per day than they sleep.
Ergotron. "New Survey: To Sit or Stand? Almost 70% of Full Time American Workers Hate Sitting, But They Do it All Day Every Day." PR Newswire, 17 July 2013. http://www.prnewswire.com/news-releases/new-survey-to-sit-or-stand-almost-70-of-full-time-american-workers-hate-sitting-but-they-do-it-all-day-every-day-215804771.html Accessed 19 October 2016.