Those are some good points. I think a couple of those would be really hard for me. Most specifically the sitting still and being quiet for ten minutes. My mind is always racing and I have a feeling it would be impossible to shut it off without drugs! I like the idea of getting uncomfortable though. I might try to implement some of those!
Finding stillness in current society can be difficult but it's worthwhile and can start with a single minute which, just thinking out loud here, I don't think is beyond anyone on this planet no matter who they are.
No, I could probably handle a minute. Much more than that and I am likely thinking about that embarrassing I did or said twenty years ago
Start with a minute,clear the mind, and then work up to two and so on. You'll not regret it. It's not easily done to be honest, but is worthwhile.