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The river failed water quality tests a month before the start of the games due to high levels of E. coli. But organisers say that the Seine is safe to swim in, with Paris mayor Anne Hidalgo and other members of the Olympic committee going in for a dip in mid-July to prove that the water is clean. (Read about the efforts to tackle the Seine's historic pollution.)

Mohan hopes to swim in the Seine at the Paris Games. "Growing up, I never got to swim in my own river in Ahmedabad because it was so polluted," she says. "It's scary that in future the triathlon might not be an outdoor sport due to climate change."

Extreme heat is already changing her sport. Mohan says she can no longer train outdoors in India due to the scorching temperatures. This reality has forced her to move away from her home and train in London instead. The conditions faced by the cross-country runners in the 1924 Olympics are becoming increasingly common for athletes. Mohan has competed in temperatures exceeding 40C (104F) and 50-80% humidity.

"If I had a choice, I wouldn't have done those races," she says. "But as athletes we are wired to perform our best and to keep pushing ourselves."   

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The graphs in this story were created by Diana Mota.

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Security forces in Venezuela have fired tear gas and rubber bullets at people protesting Sunday’s disputed election result.

Thousands of people descended on central Caracas on Monday evening, some walking for miles from slums on the mountains surrounding the city, towards the presidential palace.

Protests erupted in the Venezuelan capital the day after President Nicolás Maduro claimed victory.

The opposition has disputed Mr Maduro's declaration as fraudulent, saying that after reviewing 73.2% of the voting tallies, it was clear that its candidate, Edmundo González, had won convincingly.

Opinion polls ahead of the election suggested a clear victory for the challenger.

Opposition parties had united behind Mr González in an attempt to unseat President Maduro after 11 years in power, amid widespread discontent over the country's economic crisis.

Choreographed celebrations but opposition demands proof

A heavy military and police presence was on the streets of Caracas with the aim of trying to disperse protesters and prevent them from approaching the presidential palace.

Crowds of people chanted “freedom, freedom!” and called for the government to fall.

Footage showed tyres burning on highways and large numbers of people on the streets, with police on motorbikes firing tear gas.

In some areas, posters of President Maduro were ripped down and burned while tyres, cars and rubbish were also set alight.

Armed police, military and left-wing paramilitaries who are sympathetic to the government clashed with protesters and blocked off many roads around the city centre.

Venezuela's government also announced a temporary suspension of commercial air flights to and from Venezuela with Panama and the Dominican Republic starting from 20:00 local time on Wednesday.

In a speech on Venezuelan state television, Mr Maduro said it is his "obligation to tell you the truth".

"We are all under the obligation to listen the truth, to gear up with patience, calmness and strength because we are familiar with this movie and we know how to face these situations and how to defeat the violent.”

The BBC spoke to a number of people who attended one protest in a densely-populated area known as La Lucha, meaning “the fight”.

Paola Sarzalejo, 41, said the vote was “terrible, fraud. We won with 70%, but they did the same thing to us again. They took the elections from us again.

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