I remember that I liked to do that when I was a kid (particularly in fifth grade), and I'm currently in my second-year in college. That means that it's been nine years passed🫢. When I was young, I called them loom bands and my favorite way to assemble them was the regular stitch, where you'll create an infinity sign to insert in your two fingers and add another rubber. After that, raise the two sides of the infinity sign upward and repeat the process.