> Bert Kreischer is an overweight comedian, likely alcholoic, with no training regiment, and he completed a full marathon in 5h33m.
That is really sort of thing you should not do.
I guess you can walk most of marathon, marathon distance is not some kind of unachievable hike. But as of actually running it, you should not and would not manage to run.
I ran a half marathon on sand with no training, find a pace you're comfortable with and stick to it. Knees were fine, delayed onset muscle soreness the next day was extreme but passed. (had I not had to turn back because of a river mouth I would have gone further)
That is really sort of thing you should not do.
I guess you can walk most of marathon, marathon distance is not some kind of unachievable hike. But as of actually running it, you should not and would not manage to run.