F1 star Valtteri Bottas shares video of completely naked sauna session on Instagram as Lewis Hamilton’s former team-mate prepares for the Singapore Grand Prix with his ‘daily ritual’

Formula One star Valtteri Bottas has geared up for the Singapore Grand Prix by sharing a video of himself taking a sauna completely naked.

The Finnish driver's unusual preparations on race weeks has seen him spend as much time in the nude as he has behind the wheel.

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Bottas memorably caused a storm for baring his rear during a swim in the ice-cold waters of Aspen days after his points finish at the Miami GP in May.

The 33-year-old's form has suffered a steep decline since, with three DNF's in his last four races, and without a point since June.

Yet F1's unexpected three-week break due to the cancelled Russian Grand Prix has given Bottas extra time to prepare for Singapore.

And the Alfa Romeo star has shown fans that he's not breaking a sweat about the hot conditions of the Asian circuit.

Bottas took to Instagram to upload a video of himself sitting in a sauna in his birthday suit with nothing but a reindeer hat on.

To avoid exposing his own personal gear stick, Bottas also held a can between his legs to maintain his modesty.

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Speaking while flinging more stones onto the fire pit, he said: "Singapore prep for some, Finnish daily ritual for us."

The former Mercedes man captioned the post: "Some call it heat training but for others it’s just a daily ritual."

Bottas revealed earlier in the season the story behind his naked antics as he memorably gifted Lewis Hamilton a viral photo of himself swimming naked in the US.

Explaining the present, he told talkSPORT 2’s Driven Chat with Andy Jaye: “This photo came up, it was in Aspen between some of the US races and I was with my friend and decided to go for a swim.

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“As usual, as a Finn it’s pretty normal to be naked especially if you go sauna or swimming so I decided to take a dip on the river.

“Then just the evening I was looking at the photos and one looked like a pretty artistic photo like almost like a piece of art and my girlfriend was like ‘Actually that’s a really good picture’.

“Then we came up with this idea, I just posted it on Instagram, I didn’t put any comments just posted, and then it kind of exploded and we decided that we could do something for charity.

“So we sold prints of it for 24 hours, and in 24 hours we sold over 5,000 prints of my bum, and then the last print we had left I gave it to Lewis framed because he had said in one interview he liked the photo so I thought he deserved one.”