2024 Olympics: What Made Triathlete Tyler Mislawchuk Throw Up 10 times After Swim in Seine River

Tyler Mislawchuk knows that to be successful, one has to give it their all. 

And sometimes, that comes with a whole lot of puke. After the athlete, who represented Canada in the 2024 Paris Olympics, went viral for throwing up 10 times after swimming in the Seine River during the men’s triathlon July 31, he gave insight into what really caused his upset stomach.

"I happened to swallow a lot of water during the race," Tyler told CBC Aug. 1. "Nothing to do with the quality. My stomach was just extremely full, and so that ended up being a limiting factor for me in the race. You put that with one hour, 40 minutes of going as hard as you can, stuff’s going to happen."

The 29-year-old, who placed 9th in the competition, didn’t expect his post-race moment to make headlines. Laughing, he added, "It’s all over the internet and it's not why I want to go viral."

The weather was also a factor. Being from Canada, where he emphasized how cold it can get, he’s not quite acclimated to France’s summer weather, either. But that didn’t stop Tyler—who had to withdraw from the 2020 Tokyo Games due to an Achilles injury—from giving it his all.

"At my last Olympics there was the injury and with all the stuff that happened there was a lot of 'what ifs,'" he explained to Triathlon Magazine in an interview published July 31. "I have no 'what ifs' on the day, I went for it, it was absolutely everything. I vomited 10 times after the race … it got hot in the last laps."

It’s not surprising that the Seine River’s water quality came into question when he started vomiting, as their race was postponed from its initial July 30 start date due to unsafe levels of fecal matter following heavy rain.

Tyler wasn’t the only athlete to speak about the Seine’s water quality. Belgian triathlete Jolien Vermeylen, who competed in the women’s race after the men’s, shared her less than impressed decision to hold the competitions in the famed river.

"While swimming under the bridge, I felt and saw things that we shouldn’t think about too much," she told reporters. "The Seine has been dirty for a hundred years, so they can’t say that the safety of the athletes is a priority. That’s bulls--t!"

Ahead of the 2024 Olympics, the city of Paris spent $1.5 billion to clean up the Seine, where swimming had been banned since 1923. To soothe critics' concerns, the city’s mayor Anne Hidalgo, Paris 2024 Olympic President Tony Estanguet and other officials took a swim in the river to prove its safety.

"The water is wonderful," Anne told NBC News after her swim July 17, noting that the water was "very cool and very nice."

Keep reading for more moments at the 2024 Olympics.

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LeBron James proved once again he knows his way towards a slum dunk.

Kim Yeji of Team Republic of Korea was busy prepping during the Women's 10m Air Pistol Final.

Egypt's Omar Assar leapt for the ball during an intense game of table tennis.

Cassandre Beaugrand of Team France was excited (and exhausted!) after winning gold in the women's individual triathlon.

Team Brazil's Rebeca Andrade and Team USA's Simone Biles and Suni Lee posed for a selfie during the Gymnastics Women's All-Around Final medal ceremony.

Nigeria's Pallas Kunaiyi-Akpanah jumped for the ball during her match against France. 

Men's foil windsurfing embraced the wind as they raced to the finish. 

For Simone Biles, the limit to greatness does not exist. 

Caroline Marks of Team USA surfed her way closer to a medal. 

Suni Lee's balance beam routine was captured from a bird's eye view. 

Gold medalist Jiayu Yang of China lapped compatriot Hong Liu. 

France's Florent Manaudou had a cheeky greeting for the crowd. 

French cyclist Anthony Jeanjean lost his shoe during a fall at the men's BMX freestyle park final. The Olympian went on to brush off his tumble and snagged the bronze medal with his second run.

Diving practice never looked so fun.

Team USA's Katie Ledecky was ecstatic after winning gold in the women's 1500m freestyle final.

Japan's Shinnosuke Oka held his nation's flag behind him as he celebrated earning the men's all-around individual gold medal. 

Men's individual triathalon athletes dove into the newly cleansed Seine River. 

Andrea Spendolini-Sirieix and Lois Toulson from Great Britain were perfectly in tune with each other.

Felix Dolci of Team Canada sent the crowd a heart after he redid his high bar performance following a fall due to a broken grip. 

Cassandre Beaugrand of France crossed the finish line for the women's triathalon. 

The  U.S. women's rugby team celebrated the country's first ever medal in the sport with their bronze win. 

Argentina's Jose Torres Gil went all in during his BMX freestyle performance. 

Team China's Yawen Deng gave quite the performance during the BMX freestyle competition.

Everyone was impressed by Team Germany's ability to get some air.

Marjorie Delassus of France was locked in during her canoe slalom semifinal competition. 

Simone Biles and her teammates cheered on after their victory. 

Italy's epee team couldn't contain their excitement after besting France in their gold medal bout. 

Greece's Theodoros Tselidis and United Arab Emirates' Aram Grigorian faced off in the judo 90-kg competition. 

Leon Marchand of Team France gave a whole new meaning to "green eyes" while competing in the Men's 200m Breaststroke Semifinals.

Watch the 2024 Paris Olympics daily on NBC and Peacock until the summer games end with the Closing Ceremony on Sunday, Aug. 11, at 7 p.m. ET/PT.