Summer McIntosh, a 16-year-old, broke the women’s 400m freestyle world record at Canada’s swimming trials on Tuesday night.

McIntosh clocked 3 minutes, 56.08 seconds in Toronto. Australian Ariarne Titmus held the previous record of 3:56.40, set last May. Before that, Katie Ledecky held the record since 2014, going as low as 3:56.46. Read More