Piscine Keller

Built in the 1960s, the Keller pool was totally renovated in 2008, in the image of its host Beaugrenelle neighbourhood. Its changing rooms are particularly luxurious, but it is also a standout due to the fact it treats its water with ozone filtering rather than chlorine. The water is filtered and disinfected in this way every four hours – you can kiss that chemical smell goodbye.

Equipped with its 50m long Olympic swimming pool (as well as a smaller pool of 15m), Keller also benefits from an sliding roof, which lets the sun pour in on fine days. Competitive swimmers come here to benefit from the Olympic proportions and when they are in a team, it can put some pressure on the space. That said, the pool opens at seven in the morning, so there’s plenty of space for early risers.