What exercises can I do at work?

[WhoNeedsEnemiesWithFreindsLikeThese]

I work 10-hour shifts and I am on my feet all day. I also wear trainers/ plimsoles to work. I do a lot of walking in my job, and there are stairs.

There is also quite a bit of standing around and so I am thinking I could be doing some exercises. I need to work on my middle. I can't do sit-ups at work, but are there any exercises I can do standing up that will benefit me? I could get a fair few in.

Standing isometrics? There are lots of collections of isometric exercises so you'll need to pick out the ones that work when standing.

https://www.webefit.com/articles_400-499/article_462_isometrics.html

https://www.womenshealthmag.com/fitness/a20702490/isometric-workout/

https://strongmadesimple.com/blog/bodyweight-isometric-exercises

Side crunches (obliques?)

knee raises

lunges

put dumbells
in your pockets

pelvic floor squeezes and bum cheek squeezes

wall pilates