This is a sample sentence from this lesson:
J'ai de plus en plus de mal à me concentrer.
I understand the more and more part. As a student, without the translation, I would not have come up with I'm struggling more and more to focus. I was seeing this as ... I have (more and more) pain myself to concentrate. Is there a lesson on avoir mal a that talks about struggling? If so J'ai de plus en plus de mal avec cette example! :)