Canadian teenager Summer McIntosh smashed the 400m freestyle world record in some style on Saturday, recording a time of 3:54.18 at the Canadian Swimming Trials.

That time trimmed more than a second off the previous mark held by her longtime rival Ariarne Titmus, who beat the 18-year-old to the Olympic gold medal in this event at the 2024 Paris Games.

Still, breaking this world record provoked an emotional outburst rarely seen from McIntosh as she smashed the water and clenched her fist in celebration after noticing her time.Gold medallist Canada's Summer Mcintosh poses after the women's 200m butterfly swimming event during the Paris 2024 Olympic Games at the Paris La Defense Arena in Nanterre, west of Paris, on August 1, 2024. (Photo by SEBASTIEN BOZON / AFP) SEBASTIEN BOZON/AFP/AFP via Getty Images

McIntosh previously held the world record in this event before Titmus snaffled it, the Canadian recording a time of 3:56.08 in March 2023, almost two seconds slower than the mark she set on Saturday.

This time around, she set off slower but recorded a blistering second half of the race to improve on her time.