Lewis Hamilton says Formula One should provide a greater physical challenge to emerging drivers, declaring it a "man's sport".
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.
Lewis Hamilton (AAP)19-year-old Lando Norris, George Russell, 21, and the London-born Thai Alexander Albon, 23, are all enjoying their maiden campaigns.
Responding to Hamilton's comments, McLaren driver Norris said: "It must be projected at me, George, Alex, because we're the younger people coming into Formula One.
"You are always trying to push the envelope," said Hamilton, who arrived in Montreal late on Wednesday night following a short break in New York.