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Robert Kubica has insisted he is not driving one-handed and is in better physical shape than when he was last racing in Formula 1 back in 2010.

The Pole is bidding to return to F1, six years after suffering life-threatening injuries from a rally crash in 2011, with Williams.

He drove a 2017 Williams on day one of Pirelli tyre test at Yas Marina in Abu Dhabi on Tuesday, completing 100 laps and trying a range of tyres.

Kubica will return to the car on Wednesday for a couple more hours of running, when he is set to focus more on performance runs.

There have been some concerns about his fitness, particularly regarding the use of his right arm, but Kubica moved to dispel those fears.

"There is someone saying I'm driving one-handed. I'm not driving one-handed," he said.

"I think it's impossible to drive a Formula 1 car with one hand.

"But I have some limitations so in some way my body used some compensations, which is not wrong.

"We are human beings and our brains are used to help our bodies overcome disabilities. This is normal daily life.

"This is something I think I'm on top of."

Kubica has undergone an intensive training regime this season in a bid to make sure he is in shape to cope with the increased physical demands of the new generation of F1 cars.

"Physically I think I have done great work in the last six months," he said.

"It hasn't been easy, it was not like I have been lying in my bed.

"Probably I'm in physically in my best shape, by far a better shape than I was when I was racing in 2010.

"So motivation is there and the body is reacting in a good way.

"Of course I'm starting nearly from scratch because Formula 1 has changed so much in the last seven years that it's like nearly starting from zero.

"But my experience which I gained in the years I was racing in Formula 1 helped me to get on top of the learning process quicker than it used to be in the past."

Kubica faces competition from Sergey Sirotkin, Daniil Kvyat and Paul di Resta for the second Williams seat but is the overwhelming favourite to get the green light as Felipe Massa's replacement.