Let's get physical and more diverse, says Hamilton

FILE PHOTO: Formula One F1 - Monaco Grand Prix - Circuit de Monaco, Monte Carlo, Monaco - May 26, 2019 Mercedes' Lewis Hamilton celebrates winning the Monaco Grand Prix after the race REUTERS/Benoit Tessier

MONTREAL (Reuters) - Formula One needs more diversity and drivers need to toughen up if the sport is to become more entertaining and grow, five-times world champion Lewis Hamilton said on Thursday.

Years of tweaking the rules and attempts to control costs have only marginally improved the product, the Briton told a news conference ahead of Sunday's Canadian Grand Prix.