After a long hard run, a day or two after, I find my weight goes up, by a few pounds. This is not what I expect, except that I have come to expect it. I think it has to do with my leg muscles being sore - inflammation or something, extra water retained in my quads and hams.
I don't know why, but without fail
my weight goes high on the scale.
Ok, I googled it, and my hypotheses are proposed by others as well. I didn't see a scientific study on the topic, but it's widely reported as an effect.
It isn't just me.
I have company.