The core of the Refold method is "immersion" — spending time doing things in the target language, usually consuming media. It does not mean living in a country that speaks the language (though that would certainly add to it).
It may feel odd and unproductive to spend time watching TV in your target language. Rest assured: it's not a guilty pleasure. It is where language acquisition happens. Even when something is mostly incomprehensible, your brain is hard at work looking for patterns, testing hypotheses, and building your internal language machine.
When you first start immersing, your brain will discard most of the information because it doesn't think it's important. You'll probably find it hard to focus for more than a few minutes at a time. But focusing intently on target language content signals to the brain that it needs to start paying attention and learning.
This "focus" is what we call active immersion — time spent actively trying to understand, even if you don't.
Active immersion is the most important activity in language learning.
If you aren't paying attention or focused on the language, you're not learning. Immersion isn't magic (even though it may feel like it sometimes). You gotta put in hard work if you want it to work.
Throughout the roadmap, you'll encounter different types of immersion. They're introduced at the points where they become most useful, but here's a brief overview:
Interactive immersion is when you use tools and techniques to understand more than you otherwise would — pausing, looking things up, replaying audio. This is your primary immersion activity in the early phases. Interactive Reading with Audio
Freeflow immersion is closer to what you do in your native language — you focus on the content and let understanding happen naturally, without stopping to look things up. This becomes important once you have enough base knowledge. Freeflow Immersion
Both types are critical. The balance between them shifts as you progress. The line between isn't as clear-cut as I make it seem. They really exist on a spectrum from more interactive to more freeflow. But the distinction is still valuable.
In order to immerse, you need things (TV, movies, books, podcasts, articles, etc.) in your target language. Finding the right content matters a lot, and we give specific recommendations in each phase. But the general principle is simple: you must enjoy what you're immersing in. 0D — Enjoy the Process
Since the method is built so heavily on content immersion, enjoying your materials isn't optional — it's a core requirement for success. Different kinds of materials will be more or less useful at different stages, but enjoyment is always the top priority.
Start in places where you already consume content. If you watch YouTube, that's a great source. If you like reading books, they can be part of your learning. The more your immersion looks like something you'd do for fun, the more likely you are to stick with it.
The idea that language acquisition happens through exposure to understandable messages — comprehensible input — was formalized by Krashen (1982) and has been extensively supported and refined over the following decades. The core claim that your brain needs to understand what it's hearing in order to acquire the language is well-established, even among researchers who disagree with Krashen on other points.
The distinction between interactive and freeflow immersion maps onto concepts from the broader SLA literature. Interactive immersion aligns with what researchers call "form-focused" or "meaning-focused" activity with attention to language, while freeflow immersion is closer to extensive reading/listening. Research on extensive reading (Day & Bamford, 1998) and incidental vocabulary acquisition (Webb, 2020) supports the value of large volumes of meaning-focused input. Meanwhile, studies on reading-while-listening (Webb & Chang, 2015) show that combining text with audio is more effective for vocabulary acquisition than either channel alone — which is why we recommend it so heavily in the early phases.