This comes from Essentialism by Greg McKeown.
I’m paraphrasing: That when you’re multi focusing you’re trying to focus on two things at the same time and humans are terrible at that. We’re not even good at multitasking. I’m probably worse than most.
Multi-tasking shallow activities is something we can do. Like we can drive a car and listen to the radio at the same time, but–I don’t know about you–but I can’t read a book and watch tv. That’s why I shut down the internet when I’m writing or working on something. I can listen to music in the background while I write, but I can’t listen to music when I’m editing.
You can do this in a variety of ways. There are Chrome extensions WasteNoTime, Self Control, and Freedom. I’ve tried them all and I have to say Freedom works great because it works across your phone, your laptop, and tablet. Where the others don’t. Sure, Freedom costs, but I think taking hold of your attention and ability to focus on what matters is worth the 15 bucks a year to spend on Freedom. That’s kind of a key Essentialist trait.