Canadian swimmer Summer McIntosh, 18, broke her own world record in the 400-metre individual medley with a time of 4:23.65 at the Canadian Swimming Trials on Wednesday. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS Connect with CBC News Online: For breaking news, video, audio and in-depth coverage: http://bit.ly/1Z0m6iX Follow CBC News on TikTok: https://bit.ly/3TnHioe Follow CBC News on Twitter: http://bit.ly/1sA5P9H Subscribe to CBC News on Snapchat: https://bit.ly/

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