Also wearing glasses when they're not needed. Your eyes will adapt to the accommodative stress presented. If you look at a screen all day, you'll end up with a power of roughly -2 assuming you don't wear any glasses looking at your screen, since your eyes have adapted to treat that 2 feet as optical infinity so it can remain in focus without any accommodation needed. If you then go ahead and wear prescribed glasses for close-work where they are not needed, you again restart the process.

Interestingly it has been found that only periphery matters for this process, that's how those fancy glasses like Hoya Miyosmart work, by intentionally defocusing the periphery.