Earlier quoted context omitted.
This! I read Zen tradition and their meditation is sitting, calming and contemplating on things (depending on their school). The word "meditation" is used for almost everything and in different senses.
The first variant of Zen-meditation is often to count your breathing from 1 to 10 repeatedly. Sounds easy enough, but the mind starts to wander pretty quickly. If you get lost in your counting you just start over on 1 again.
I suppose were I to subject myself to a week+ of meditation in my current state, I could conceivably "injure" myself if I were stubborn in my persistence. So maybe the warnings in this article aren't so unintuitive after all.
Would love for someone knowledgeable to contrast this form to the other forms mentioned in this thread for someone who is open minded and not a complete outsider.