[Sweat your arse off and plenty of fluids too.]
Good advice.
Back in the days when I would get the flu, I would get in bed cover up with two or three blankets, in the morning the bed was soaking wet but the fever was gone
Yeah that’s how I got rid of mine too. But I haven’t had the flu in 30 years back in my twenties. I always have a box of Tamiflu in the medicine cabinet just in case.