Warning: This is not a real exercise. In fact, it's the opposite.
Scroll down this page repeatedly for 3000 pixels. Your brain will not be improved.
Or will it?
Click here for the intermediate level, where you'll scroll for 1000 pixels.
Or, if you're feeling extra lazy, click here for the easy level, where you'll scroll for 500 pixels.
But don't say we didn't warn you...