For me it was like running slightly downhill (you feel like you want to sit, but your legs say no), but I was running on a flat surface. I went for a joint, and then ran outside, I think I would be too dumb stoned to be using weights though, as I can hardly remember the set I'm on when I'm not stoned. But it would be something to try, perhaps I'd be more alert, and be able to lift more. I was laughing when I saw other people, yetdidn't know why.
I even ran faster than I usually do, then came home and munched on cereal. lol.
I've actually done weights when (very) drunk one night, which is definately not a good idea. I thought I was the hulk. I thought wrong, when I woke with a hangover and in pain.