The Run It Straight Challenge, a viral collision sport where two large athletes run at each other at speeds exceeding 25 kilometres per hour, has evolved from an online trend into a state championship event called Run Nation, which sold over 5,000 tickets in Sydney. Neurologists are warning about the catastrophic risks of high-impact head injuries, undetected brain bleeds, and second impact syndrome from repeated collisions. Medical experts are calling for the activity to be banned following a death in New Zealand last year linked to the challenge.

From Channel 7's popular breakfast show with Natali Barr and Matt Shirvington, Sunrise brings you the show's latest news, entertainment and human-interest stories.

From Channel 7's popular breakfast show with Natali Barr and Matt Shirvington, Sunrise brings you the show's latest news, entertainment and human-interest stories.

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Sunrise

From Channel 7's popular breakfast show with Natali Barr and Matt Shirvington, Sunrise brings you the show's latest news, entertainment and human-interest stories.

Viral collision sport sparks health alarm

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