Working out in a group reduces stress by 26% 

https://www.sciencedaily.com/releases/2017/10/171030092917.htm#:~:text=Researchers%20found%20working%20out%20in,a%20study%20published%20in%20The

Studies show that even 15 minutes a day of exercise can reduce risk of major depression by 26%

Regular exercise improves focus and mental clarity

https://www.health.harvard.edu/blog/regular-exercise-changes-brain-improve-memory-thinking-skills-201404097110

Mental health

https://pubmed.ncbi.nlm.nih.gov/21658349/

https://www.forbes.com/sites/jennifercohen/2012/05/08/6-ways-exercise-makes-you-smarter/?sh=34cf1e26305d

https://www.sleepfoundation.org/articles/5-facts-about-sleep-and-exercise

Covid 

https://covid.joinzoe.com/post/lockdown-weight-gain

https://www.yalemedicine.org/news/quarantine-15-weight-gain-pandemic 

Negative health impacts of COVID: Natural Marketing Institute