I would say that you apartment mate has found a great thing- for him. I'm not the youngest or oldest on this board. I'm not the wisest or the dumbest when it comes to life. What I've found is that you need to know yourself and then you have to find what works for you. Some people need to get up early and run 3 miles first thing in the morning for them to feel good. That isn't me on both counts (running and early). To your friend's list, I don't subscribe to them as written, but all are important in their own form. Exercising is important (and I would include diet in that). Being mobile (as opposed to sedentary) is one of the most important things you can do for your physical health (next to your diet). I don't meditate, but the purpose of meditation is mental health. My mental health is improved by taking some alone time (I'm a strong introvert) and doing something I like (I'm an activity type). Fishing is one, hunting is another. Reading is about learning something new and building new neural connections. You can do the same with tasks or meeting and listening to people. Writing is your outlet. Everyone needs an outlet whether it is writing something, talking to someone, or some other thing that will help you take what's in your head, digest it, and get it back out. Finding your version of those things will go a long way to your happiness in life.
Then, I have two main rules:
1- "You do you." That means a couple things. Don't worry about other people's business. If it isn't interfering with 'you' then not your problem. Do the things that are right for you (and your family/significant people). Worry about your own business.
2- "Don't be a 'dirtbag'". I normally use another word instead of dirtbag that I think would get me a warning here. I'm sure you can guess it. I could say be nice and kind and helpful all of the time, but we know that doesn't always happen. So if you're choosing how to act in a situation or how to treat someone, "don't be a dirtbag".
If any doubt about one rule, consult the other.