Teen girls...how do you...?

In school today (I am fourteen btw) and I noticed that the pair of dark wash laguna skinny jeans from hollister I was wearing kept sliding down. So I kept having to pinch the waistband and pull really hard to get them to move an inch. My question is kind of an interesting one just for fun: How do you pull your jeans up (hollister, especially) when there fallinnnn?