If you wear skin tight jeans the fold probably will be noticable, as any phone would be. It really is a question of do you want wide bulk or thick bulk. The weight, I can't say much but it's there. It doesn't bother me as the bonus of opening to a tablet screen over powers that for me, and I like some weight anyway, when they are light they seem to feel cheap to me, that's me though.
As far as exercising with it in gym shorts, yes that would be a issue, but I thought it was with the notes and S22U also. That's one of the reasons I have the Samsung watch 4. I pair my headset to the watch and leave the phone home. I have the LTE version so I can also stream it. The watch does decent tracking exercise.
For years Samsung has had the note or the S Series, and they essentially became the same phone, spen being the difference. Samsung now has the S Series and the Fold. They are indeed different phones now. Comparing the 2 is like apples and oranges. The note started out expensive and huge also, Samsung stayed determined and made a great phone thru the years, now they are doing that with the fold, it will improve year after year, prices will start dropping, let's remember we had some$1,500+ notes, and weight will get better, everything will get better. IMO, Samsung has done nothing but great with the fold series, first fold not so much, but huge improvements with the rest.