We can't say we didn't see this coming with the competitive nature of this event, but EXO's Tao and INFINITE's Woohyun and Sungyeol were revealed to have suffered minor injuries while filming the 'Idol Star Athletics Championship'. 

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According to reps at the scene at Goyang Stadium, Gyeonggido on September 3, Tao injured his back while competing in the high-jump challenge. It's said he hit his back the wrong way while he was jumping. His fellow members escorted him out to receive treatment, and Tao later returned and assured fans that he was alright.

Woohyun and Sungyeol also injured their chin and back when playing in the futsal [indoor soccer match] games while getting competitive and bumping into people.

INFINITE's agency calmed worried fans who heard the news by responding, "Thankfully, it wasn't a big injury. They only slipped slightly, it's not something that fans need to worry about."

Hopefully, the rest of the idol stars got through the filming safe-and-sound!

Source: Star Today via Nate, Sports Seoul via Nate