Choose a sport (boxing, ice-skating, football, rugby, etc.), and research the pros and cons of the sport. Your research should be reliable and extensive (10 to 15 sources minimum).
These journals, articles, and resources are a good place to start:
British Broadcasting Co. Are Sports Becoming Too Dangerous?
National Center for Injury Prevention and Control (US Department of Health and Human Services)
Journal of Sport & Health Science (JSHS)
NFL Concussion Litigation
Journal of Orthopaedic & Sports Physical Therapy
