I realized this concept two days ago and shared it with a friend, and we discussed it together. It's interesting to see a video about it here on YouTube. At the end of the video, you mention that you're not sure why this helps with concentration. I think it helps because our brains contain a lot of so-called "silent knowledge" that comes to mind when we're in the shower or taking a walk and not thinking about anything specific. For example, if you have a habit of constantly checking your phone and browsing social media or watching random videos, your mind gets trained to always do something during quiet moments.
This might not seem like a big deal at first, but if it becomes a habit, I’ve noticed that it can make the brain more passive. Instead of letting your thoughts flow freely and enjoying the brain’s natural process, you're likely trying to raise your dopamine levels through passive scrolling. The brain then becomes accustomed to easily obtaining dopamine by just picking up the phone, so you no longer feel the need to seek it from other sources.
How does this relate to the video? By taking 17 minutes to focus on your own thoughts, you direct your brain to get dopamine from things that genuinely interest you. This also helps your brain adapt to new things, which, through repetition, can have many positive effects.
For example, if you spend three months watching TV for 2-4 hours every day, it might be difficult to change your habits all at once because your brain has become accustomed to this as a good and effective way to spend time, even if you feel like you want to do something else but lack the energy.
If you add this 17-minute program to that routine, it might steer your interests in a new direction, so you no longer find watching TV as enjoyable and start becoming interested in other things.