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Research shows there's a link between head trauma and neuro-degenerative diseases.
Just this week, Hall of Fame American Football NFL quarterback Brett Favre was the latest high-profile player to reveal he had Parkinson's disease. The 54-year-old estimates over his 2-decades career he's had thousands of concussions.
In the UK, 700 former rugby union and league players suffering from concussion-related neurological injuries are suing World Rugby, England's Rugby Football Union and the Welsh Rugby Union.
They say these governing bodies have failed in their duty of care to protect them from injuries sustained while playing.
Former professional Welsh rugby union player Antony Evans developed Parkinson's aged 42 and talks to Saturday Morning about why he's involved in the British litigation.
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