F1 should have a heavier toll on younger drivers, claims Hamilton
Lewis Hamilton has said Formula One should provide a greater physical challenge to emerging drivers, declaring it a "man's sport".
The current grid is the youngest in the sport's history, with half of competitors 25 or under at the start of the campaign.
Hamilton began his career at 22 with McLaren but, now in his 13th campaign, the five-time world champion believes it has become too easy for the new school.
Hamilton, who was speaking in Montreal ahead of Sunday's Canadian Grand Prix alongside McLaren rookie Lando Norris, who at 19 is the youngest driver in the sport, was quizzed on how he would improve F1's spectacle.
"I would make it harder for the drivers," he said. "It is a man's sport. A lot of youngsters come in and it is quite easy for them to get straight into it.
"You should be physically exhausted after a race, to the point it should be so exhausting it is like you have run a marathon.
"Sometimes you do these races and I could do another two or three in a row. Formula One shouldn't be like that."
Hamilton will head into Sunday's race bidding to emulate Michael Schumacher by winning at the Circuit Gilles Villeneuve for a record-equalling seventh time.
The Englishman, who holds a 17-point championship lead, will be boosted by a fresh engine - his Mercedes team confirming on Thursday that they will run their new unit here this weekend.
"You are always trying to push the envelope," said Hamilton.
"It hasn't been the smoothest ride but it is always great having a new engine."