Bring the pain: Olympic swimming begins with grueling 400 IM

Chase Kalisz knows what’s coming: Pain, and lots of it in the 400-meter individual medley that gets swimming underway at the Tokyo Olympics.

Bring the pain: Olympic swimming begins with grueling 400 IM

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Bring the pain: Olympic swimming begins with grueling 400 IM

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Bring the pain: Olympic swimming begins with grueling 400 IM