When I studied abroad in college I was worried about not having easy access to a gym. I didn’t want to spend too much time on this while in Spain, but I also wanted to stay in shape. Running was obvious, but to add in some other exercises I used a resistance band every day. It was very lightweight and small, so I could easily pack it every time I travelled. I would do squats, loop it around my desk to do seated rows, or wrap it around my bed to do bench presses. Obviously it isn’t perfect, but it was very helpful for staying in shape while traveling.