You forget the importance of rest itself in self improvement.
Understanding how to improve, is a lifelong journey. Understanding how much to work, how much to rest, how much to sharpen the sword, how much you can mix those things... and how all this interplays with your personal factors is essential to get the most from yourself.
Sometimes... Watching TV and not seeing your friends, or whatever is the RIGHT thing to do. And we should have 0 shame about it when it is. I'll admit video games are my vice over TV in general. But there's times when I've gone too hard... and even gaming may be too taxing for what I can take.