Lewis Hamilton says he believes the new faster Formula 1 cars this year will be a "massive challenge". The Mercedes driver said he had trained hard but had no idea whether he was fit enough for cars which could be four seconds a lap faster than 2016. "I don't know if I'll be easily fit enough, or will struggle a bit or be super-underneath and need to work harder," the 32-year-old said. While confident, he said he did not know if Mercedes would remain in front. The three-time world champion, in an exclusive interview with BBC Radio 5 live, added that he: was over losing the title to team-mate Nico Rosberg last year looked forward to the challenge of his new partner...
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