Maxperson
Morkus from Orkus
Right, but there's different kinds of training. Competence doesn't equate to being good at everything challenging. Someone trained to be a pro basketball player isn't going to be trained to go 12 miles in grueling heat while wearing a full pack and vice versa.We don't have a good sense of what 1st level characters are supposed to be able to do, in any edition. People talk about the "off the farm" trope but no edition has really had characters start as the equivalent of untrained peasants. 5E characters in particular are very competent in the beginning, so it's hard to say.
Few, if any of the classes involve that kind of training inherently. Now if you're playing some sort of military campaign, and I've been in some of those, then yes that sort of training would be par for the course. A cleric, paladin, sorcerer, wizard, bard, rogue, etc.? Not without some sort of back story to explain it. Fighters and especially rangers could get a pass on it, though.