1. Bellis M. “A Brief History of Sports.” ThoughtCo, Oct. 16, 2019, thoughtco.com/history-of-sports-1992447 (last access: 20th April 2020).
2. https://en.wikipedia.org/wiki/History_of_sport (last access: 20th April 2020).
3. Crowther NB. Sport in Ancient Times. Praeger series on the ancient world, ISSN 1932-1406. Westport, Connecticut: Greenwood Publishing Group. p. xxii. ISBN 9780275987398. Retrieved 30 May 2018. People in the ancient world rarely practiced sports for their own sake, especially in the earliest times, for physical pursuits had strong links with ritual, warfare, entertainment, or other external features. 2007.
4. Blanchard K. The anthropology of sport: an introduction. ABC-CLIO. 1995. p. 99. ISBN: 978-0-89789-330-5.
5. Karjalainen JJ, Kiviniemi AM, Hautala AJ, Piira OP, Lepojärvi ES, Perkiömäki JS, Junttila MJ, Huikuri HV, Tulppo MP. Effects of physical activity and exercise training on cardiovascular risk in coronary artery disease patients with and without type 2 diabetes. Diabetes Care. 2015;38(4):706–15.