I get what you´re meaning - but what would a good equivalent in English be?
I don't know that there is a good English equivalent for the context of feeling seg while running. Google translate gives: tough, rubbery, leathery, viscous, gluey, ropy, wiry and dogged. But that doesn't make any sense in the context of a training run. I guess I might say something like "my legs were dead."
Yeah, I haven´t found a good substitute either. Best way to avoid that language problem to make sure you never feel that way.
Any idea if there is an equivalent in Norwegian?
I figure Norwegians don't get seg so they don't have a word for it.
Wouldn't "chewy" be a good word? When your legs are tired, pushing them is a bit like chewing octopus... you chew and you chew and seemingly make no headway.
I like "leathery". That makes perfect sense to me. Still tough, but missing that elasticity and spring.